Wide-band Air-Fuel (Lambda) Gauges |
Stack Wideband Air-Fuel Ratio (Lambda) gauges are the ultimate tuning aid! Dimmable dual digital red numeric and multi-colour radial LED displays provide accurate real-time readout of either air/fuel ratio or lambda (user-selectable) in a format that is optimised for driver viewing. User adjustable scaling allows for tailored calibration for specialty fuel types and maximum display resolution per application. Inbuilt peak lean value recall and user programmable alarm setting enable quick data review and driver alerts. Inboard photo sensor provides automatic display intensity adjustment for varying ambient lighting conditions (manual driver control may be enabled via switch connection to the illumination wire on the loom). 0-5Volt analogue and serial data outputs may be connected to a data-logger, ECU or other device to provide real-time closed-loop feedback for improved mapping. Pro-Control output allows automatic control of other power systems based on specific Lambda conditions. Supplied complete with wiring harness and includes Bosch LSU4.9 sensor.
The product can be used with the following fuels:
Fuels |
Stoichiometric Air/Fuel Ratio |
Unleaded Petrol |
14.7:1 |
Methanol |
6.4:1 |
Ethanol |
9.0:1 |
LPG (Propane) |
15.5:1 |
CNG |
17.2:1 |
Stoichiometric Air/Fuel Ratio is the chemically correct ratio where theoretically all the oxygen and all of the fuel are consumed. The mixture is nether rich or lean. Note: The product is suitable for use with Nitrous oxide (where legal).
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Wide-band Air-Fuel (Lambda) Gauge |
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ST3404 |
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Includes sensor as standard: |
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Wide-band Lambda O2 Sensor
Weight w/o Cable |
120 g |
Length |
84 mm |
Wrench Size |
22 mm |
Tightening Torque |
40 … 60 Nm |
Max. Vibration (stochastic peak level) |
100 g |
Exhaust Gas Temperature Range (Operating) |
930 °C |
Exhaust Gas Temperature Range (Maximum) |
< 1030 °C |
This sensor is NOT recommended for leaded fuel or two stroke engines.
Gauge comes complete with wiring harness and associated sensor. Replacement sensors available.
Professional Stepper Motor Analogue Gauges |
These precision auxiliary instruments combine digital microprocessor accuracy with a high-precision stepper motor needle movement, to provide a new level of accuracy and reliability in 52mm gauges. They combine the durability and readability of 270° mechanical gauges with the easy installation and safe operation of conventional electric gauges.
The 270° dialface together with the new white LED backlighting and illuminated needle ensure excellent readability day or night.
Key Features:

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- 52mm diameter
- Fast, smooth stepper motor needle drive
- 270° full sweep movement for excellent readability
- Remotely mounted solid-state sensors keep hazardous fluids in the engine compartment
- Better than 2% accuracy
- All-electronic design for maximum reliability
- White LED through-the-dial backlighting
- Black dialface with White LED illuminated needle or White dialface with Orange LED illuminated needle
- Classic Range features aircraft style perimeter incandescent lighting for a period correct look
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Roll over images below to see illuminated state.
Oil Pressure |
Professional Stepper Motor Analogue |
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ST3301 |
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0-7 BAR |
0-100 PSI |
M10x1 |
1/8NPT |
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ST3301C |
ST3302C |
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ST3351 |
ST3352 |
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Fuel Pressure (Low) |
Professional Stepper Motor Analogue |
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ST3303 |
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0-1 BAR |
0-15 PSI |
M10x1 |
1/8NPT |
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ST3303C |
ST3304C |
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ST3353 |
ST3354 |
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Fuel Pressure (High) |
Professional Stepper Motor Analogue |
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ST3305 |
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0-1 BAR |
0-15 PSI |
M10x1 |
1/8NPT |
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ST3305C |
ST3306C |
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ST3355 |
ST3356 |
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Water Temperature |
Professional Stepper Motor Analogue |
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ST3307 |
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40-120°C |
100-260°F |
1/8NPT |
1/8NPT |
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ST3307C |
ST3308C |
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ST3357 |
ST3358 |
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Oil Temperature |
Professional Stepper Motor Analogue |
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ST3309 |
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40-140°C |
140-280°F |
1/8NPT |
1/8NPT |
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ST3309C |
ST3310C |
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ST3359 |
ST3360 |
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Boost Pressure |
Professional Stepper Motor Analogue |
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ST3311 |
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-1.0 to +2.0 BAR |
30inHg to +30 PSI |
T-Fitting |
T-Fitting |
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ST3311C |
ST3312C |
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ST3361 |
ST3362 |
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Exhaust Gas Temperature |
Professional Stepper Motor Analogue |
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ST3313 |
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0-1100°C |
0-2000°F |
1/8NPT |
1/8NPT |
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ST3363 |
ST3364 |
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Fuel Level (Programmable)* |
Professional Stepper Motor Analogue |
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ST3315 |
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Programmable |
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ST3315C |
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ST3365 |
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*The Fuel Level gauge has 7 pre-set and a universal-programmable calibration, to suit all normal tank sensors with a resistance range of 0-280 ohms. |
Battery Voltage |
Professional Stepper Motor Analogue |
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ST3316 |
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8 - 18 V |
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ST3316C |
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ST3366 |
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12 Hour Analog Clock |
Professional Stepper Motor Analogue |
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ST3317 |
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12 hrs |
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ST3317C |
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ST3367 |
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All gauges come complete with wiring harness and associated sensor except fuel level and voltage gauges.
These low-priced electrical auxiliary instruments feature advanced 90° air-core movements and simple 3-wire installation. Electrical sensors keep hazardous fluids in the engine compartment. White LED backlighting and illuminated needle ensure excellent readability day or night.
Key Features:

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- 52mm diameter
- 90° sweep
- No large connectors and tubing coming out the back.
- Can be mounted in more unusual positions without connections showing.
- Easier to install in tight areas.
- Easier to install a great distance from the item being measured.
- Stops fluids from entering the passenger compartment.
- Black dialface with White LED illuminated needle or White dialface with Orange LED illuminated needle
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Oil Pressure |
Electric Gauge |
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ST3201 |
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0 -7 BAR |
0-100 PSI |
M10x1 |
1/8NPT |
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ST3251 |
ST3252 |
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Water Temperature |
Electric Gauge |
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ST3207 |
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40-120°C |
100-250°F |
1/8NPT |
1/8NPT |
M10 |
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ST3257 |
ST3258 |
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Oil Temperature |
Electric Gauge |
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ST3209 |
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60-150°C |
140-300°F |
1/8NPT |
1/8NPT |
M10 |
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ST3259 |
ST3260 |
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Battery Voltage |
Electric Gauge |
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ST3216 |
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8 - 18 V |
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ST3266 |
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All gauges come complete with associated sensor (except voltage gauge).
This range of gauges have been specifically designed for vehicles with no or low powered electrical systems.
Key Features:

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- 52mm diameter
- Black dialface with White LED illuminated needle or White dialface with Orange LED illuminated needle
- Bronze bourdon tube 270° sweep movement
- Mechanical gauges do not require 12V power to operate. They make direct physical contact with the item they are reading. They do this through tubing or lines, which eliminates the need for electric signals.
- Ideal for vehicles that operate on voltages other than 12V, with no voltage at all (magneto applications) or operate on a battery with no generator.
- Note: 12 volt supply is needed if backlighting required.
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Oil Pressure |
Mechanical Gauge |
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ST3101 |
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0 -1 BAR |
0-100 PSI |
M10x1 |
1/8NPT |
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Water Temperature |
Mechanical Gauge |
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ST3107 |
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50-115°C |
120-240°F |
3/8BSP |
1/8NPT |
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Boost Pressure |
Mechanical Gauge |
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ST3111 |
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-1.0 to +2.0 BAR |
-30inHg to +30 PSI |
Universal Fitting |
Universal Fitting |
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ST3161 |
ST3162 |
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Customer Application 
Yoshihiro Nakahashi's 2006 BMW 320si (E90). Used by permission. More on Flickr.
Full Product Listing
ST3300 52mm Professional Stepper
Motor Analogue Gauges |
Black Dial Face
Options |
ST3301 | GAUGE, OIL PRESS, PRO STEPPER MOTOR, 52MM, BLK, 0-7 BAR, M10 MALE |
ST3301C | GAUGE, OIL PRESS, PRO STEPPER MOTOR, 52MM, CLASSIC, 0-7 BAR, M10 MALE |
ST3302 | GAUGE, OIL PRESS, PRO STEPPER MOTOR, 52MM, BLK, 0-100PSI, 1/8" NPTF MALE |
ST3302C | GAUGE, OIL PRESS, PRO STEPPER MOTOR, 52MM, CLASSIC, 0-100PSI, 1/8" NPTF MALE |
ST3303 | GAUGE, FUEL PRESS, PRO STEPPER MOTOR, 52MM, BLK, 0-1 BAR, M10 MALE |
ST3303C | GAUGE, FUEL PRESS, PRO STEPPER MOTOR, 52MM, CLASSIC, 0-1 BAR, M10 MALE |
ST3304 | GAUGE, FUEL PRESS, PRO STEPPER MOTOR, 52MM, BLK, 0-15PSI, 1/8" NPTF MALE |
ST3304C | GAUGE, FUEL PRESS, PRO STEPPER MOTOR, 52MM, CLASSIC, 0-15PSI, 1/8" NPTF MALE |
ST3305 | GAUGE, FUEL PRESS, PRO STEPPER MOTOR, 52MM, BLK, 0-7 BAR, M10 MALE |
ST3305C | GAUGE, FUEL PRESS, PRO STEPPER MOTOR, 52MM, CLASSIC, 0-7 BAR, M10 MALE |
ST3306 | GAUGE, FUEL PRESS, PRO STEPPER MOTOR, 52MM, BLK, 0-100PSI, 1/8" NPTF MALE |
ST3306C | GAUGE, FUEL PRESS, PRO STEPPER MOTOR, 52MM, CLASSIC, 0-100PSI, 1/8" NPTF MALE |
ST3307 | GAUGE, WATER TEMP, PRO STEPPER MOTOR, 52MM, BLK, 40-120ºC, 1/8" NPTF MALE |
ST3307C | GAUGE, WATER TEMP, PRO STEPPER MOTOR, 52MM, CLASSIC, 40-120ºC, 1/8" NPTF MALE |
ST3308 | GAUGE, WATER TEMP, PRO STEPPER MOTOR, 52MM, BLK, 100-260ºF, 1/8" NPTF MALE |
ST3308C | GAUGE, WATER TEMP, PRO STEPPER MOTOR, 52MM, CLASSIC, 100-260ºF, 1/8" NPTF MALE |
ST3309 | GAUGE, OIL TEMP, PRO STEPPER MOTOR, 52MM, BLK, 40-140ºC, 1/8" NPTF MALE |
ST3309C | GAUGE, OIL TEMP, PRO STEPPER MOTOR, 52MM, CLASSIC, 40-140ºC, 1/8" NPTF MALE |
ST3310 | GAUGE, OIL TEMP, PRO STEPPER MOTOR, 52MM, BLK, 140-280ºF, 1/8" NPTF MALE |
ST3310C | GAUGE, OIL TEMP, PRO STEPPER MOTOR, 52MM, CLASSIC, 140-280ºF, 1/8" NPTF MALE |
ST3311 | GAUGE, BOOST, PRO STEPPER MOTOR, 52MM, BLK, -1 TO +2 BAR, INCL. T-FITTING |
ST3311C | GAUGE, BOOST, PRO STEPPER MOTOR, 52MM, CLASSIC, -1 TO +2 BAR, INCL. T-FITTING |
ST3312 | GAUGE, BOOST, PRO STEPPER MOTOR, 52MM, BLK, -30INHG TO +30PSI, INCL. T-FITTING |
ST3312C | GAUGE, BOOST, PRO STEPPER MOTOR, 52MM, CLASSIC, -30INHG TO +30PSI,INCL T-FITTING |
ST3313 | GAUGE, EXHAUST GAS TEMP, PRO STEPPER MOTOR, 52MM, BLK, 0-1100ºC |
ST3314 | GAUGE, EXHAUST GAS TEMP, PRO STEPPER MOTOR, 52MM, BLK, 0-2000ºF |
ST3315 | GAUGE, FUEL LEVEL, PRO STEPPER MOTOR, 52MM, BLK, 0-280OHM PROGRAMMABLE |
ST3315C | GAUGE, FUEL LEVEL, PRO STEPPER MOTOR, 52MM, CLASSIC, 0-280OHM PROGRAMMABLE |
ST3316 | GAUGE, BATTERY VOLTAGE, PRO STEPPER MOTOR, 52MM, BLK, 8-18V |
ST3316C | GAUGE, BATTERY VOLTAGE, PRO STEPPER MOTOR, 52MM, CLASSIC, 8-18V |
ST3317 | GAUGE, ANALOG CLOCK, BLK |
ST3317C | GAUGE, ANALOG CLOCK, CLASSIC |
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White Dial Face
Options |
ST3351 | GAUGE, OIL PRESS, PRO STEPPER MOTOR, 52MM, WHT, 0-7 BAR, M10 MALE |
ST3352 | GAUGE, OIL PRESS, PRO STEPPER MOTOR, 52MM, WHT, 0-100PSI, 1/8" NPTF MALE |
ST3353 | GAUGE, FUEL PRESS, PRO STEPPER MOTOR, 52MM, WHT, 0-1 BAR, M10 MALE |
ST3354 | GAUGE, FUEL PRESS, PRO STEPPER MOTOR, 52MM, WHT, 0-15PSI, 1/8" NPTF MALE |
ST3355 | GAUGE, FUEL PRESS, PRO STEPPER MOTOR, 52MM, WHT, 0-7 BAR, M10 MALE |
ST3356 | GAUGE, FUEL PRESS, PRO STEPPER MOTOR, 52MM, WHT, 0-100PSI, 1/8" NPTF MALE |
ST3357 | GAUGE, WATER TEMP, PRO STEPPER MOTOR, 52MM, WHT, 40-120ºC, 1/8" NPTF MALE |
ST3358 | GAUGE, WATER TEMP, PRO STEPPER MOTOR, 52MM, WHT, 100-260ºF, 1/8" NPTF MALE |
ST3359 | GAUGE, OIL TEMP, PRO STEPPER MOTOR, 52MM, WHT, 40-140ºC, 1/8" NPTF MALE |
ST3360 | GAUGE, OIL TEMP, PRO STEPPER MOTOR, 52MM, WHT, 140-280ºF, 1/8" NPTF MALE |
ST3361 | GAUGE, BOOST PRESS, PRO STEPPER MOTOR, 52MM, WHT, -1 TO +2 BAR, INCL. T-FITTING |
ST3362 | GAUGE, BOOST PRESS, PRO STEPPER MOTOR, 52MM, WHT, -30INHG TO +30PSI, INCL. T |
ST3363 | GAUGE, EXHAUST GAS TEMP, PRO STEPPER MOTOR, 52MM, WHT, 0-1100ºC |
ST3364 | GAUGE, EXHAUST GAS TEMP, PRO STEPPER MOTOR, 52MM, WHT, 0-2000ºF |
ST3365 | GAUGE, FUEL LEVEL, PRO STEPPER MOTOR, 52MM, WHT, 0-280OHM PROGRAMMABLE |
ST3366 | GAUGE, BATTERY VOLTAGE, PRO STEPPER MOTOR, 52MM, WHT, 8-18V |
ST3367 | GAUGE, ANALOG CLOCK, WHT |
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ST3200 52mm
Electric Gauges |
Black Dial Face
Options |
ST3201 | GAUGE, OIL PRESS, ELECTRIC, 52MM, BLACK, 0-7 BAR, M10 (M) |
ST3202 | GAUGE, OIL PRESS, ELECTRIC, 52MM, BLK, 0-100PSI, 1/8" NPTF |
ST3207 | GAUGE, WATER TEMP, ELECTRIC, 52MM, BLK, 40-120ºC, M10 MALE |
ST3208 | GAUGE, WATER TEMP, ELECTRIC, 52MM, BLK, 100-250ºF, 1/8" NPTF |
ST3209 | GAUGE, OIL TEMP, ELECTRIC, 52MM, BLK, 60-150ºC, M10 MALE |
ST3210 | GAUGE, OIL TEMP, ELECTRIC, 52MM, BLK, 140-300ºF, 1/8" NPTF |
ST3216 | GAUGE, BATTERY VOLTAGE, ELECTRIC, 52MM, BLK, 8-18V |
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White Dial Face
Options |
ST3251 | GAUGE, OIL PRESS, ELECTRIC, 52MM, WHT, 0-7 BAR, M10 MALE |
ST3252 | GAUGE, OIL PRESS, ELECTRIC, 52MM, WHT, 0-100PSI, 1/8" NPTF |
ST3257 | GAUGE, WATER TEMP, ELECTRIC, 52MM, WHT, 40-120ºC, M10 MALE |
ST3258 | GAUGE, WATER TEMP, ELECTRIC, 52MM, WHT, 100-250ºF, 1/8" NPTF |
ST3259 | GAUGE, OIL TEMP, ELECTRIC, 52MM, WHT, 60-150ºC, M10 MALE |
ST3260 | GAUGE, OIL TEMP, ELECTRIC, 52MM, WHT, 140-300ºF, 1/8" NPTF |
ST3266 | GAUGE, BATTERY VOLTAGE, ELECTRIC, 52MM, WHT, 8-18V |
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ST3100 52mm
Mechanical Gauges |
Black Dial Face
Options |
ST3101 | GAUGE, OIL PRESS, MECHANICAL, 52MM, BLACK, 0-7 BAR, M10 (M) |
ST3102 | GAUGE, OIL PRESS, MECHANICAL, 52MM, BLACK, 0-100PSI, 1/8" NPTF (M) |
ST3107 | GAUGE, WATER TEMP, MECHANICAL, 52MM, BLACK, 50-115ºC, 3/8" BSPT (M) |
ST3108 | GAUGE, WATER TEMP, MECHANICAL, 52MM, BLACK, 120-240ºF, 1/2" NPT (M) |
ST3111 | GAUGE, BOOST PRESS, MECH, 52MM, BLACK, -1 TO +2 BAR, T-FITTING 0.187" BARB (M) |
ST3112 | GAUGE, BOOST PRESS, MECH, 52MM, BLACK, -30INHG TO +30PSI, INCL T-FITTING |
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White Dial Face
Options |
ST3161 | GAUGE, BOOST PRESS, MECH, 52MM, WHITE, -1 TO +2 BAR, T-FITTING 0.187" BARB (M) |
ST3162 | GAUGE, BOOST PRESS, MECH, 52MM, WHITE, -30INHG TO +30PSI, INCL T-FITTING |
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ST3400 52mm
Digital Gauges |
Black Dial Face
Options |
ST3403 | GAUGE, WIDEBAND AIR-FUEL RATIO (LAMBDA), PRO-CONTROL, 52MM, BLK |
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White Dial Face
Options |
ST3404 | GAUGE, WIDEBAND AIR-FUEL RATIO (LAMBDA), PRO-CONTROL, 52MM, WHT |



Where to buy Stack
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