Description
The Speedhut 2-5/8″ PLX 10-18 Air/Fuel Gauge w/ Warning (R25-WB8-REV) offers precise monitoring of your engine’s air-to-fuel ratio. Designed for compatibility with PLX Devices controllers, this gauge provides accurate readings across a wideband range of 10 to 18 AFR. Its clear 2 5/8 inch display and integrated warning light allow you to keep a close eye on crucial engine parameters, helping you optimize performance and prevent potential issues. The gauge is designed for a standard 2.67 inch (68mm) mounting hole, making it suitable for a variety of aftermarket gauge pods and installations.
KEY FEATURES AND BENEFITS:
- Accurate Wideband Measurement: Provides precise air/fuel ratio readings across a 10-18 AFR range, essential for engine tuning and diagnostics.
- PLX Devices Compatibility: Specifically designed to integrate seamlessly with PLX Devices controllers for reliable data acquisition.
- Integrated Warning Light: Features a built-in warning light that can be configured to alert you when the air/fuel ratio falls outside of a safe or desired range.
- Standard Size: The 2 5/8 inch (66.675 mm) gauge size fits common aftermarket gauge pods and mounting solutions.
- Easy Installation: Designed for a 2.67 inch (68mm) mounting hole, simplifying the installation process.
- Included Wiring Harnesses: Ships with necessary harnesses for power, lighting, and signal connections.
SPECIFICATIONS:
- Gauge Type: Air/Fuel Wideband Gauge
- Range: 10 – 18 AFR
- Size: 2 5/8 inch (66.675 mm)
- Hole Size: 2.67 inches (68 mm)
- Input Voltage: 0 volts to 4 volts
- Warning Light: Yes
- Ships With:
- 8 ft Tachometer Harness – for LED Lit Gauges (1 Wire 2 Pin Connector)
- 3 ft Power & Lighting Harness – for LED Lit Gauges and Clocks
- AF/WB Throttle Position Harness (LED Lite Gauges)
HOW TO USE:
- Mount the Gauge: Locate a suitable 2.67 inch (68mm) opening in your desired location (e.g., gauge pod, dashboard). Secure the gauge in the opening.
- Connect the Wiring Harnesses:
- Connect the 3 ft Power & Lighting Harness to a suitable power source (typically 12V switched ignition) and ground. This harness also provides power for the gauge’s illumination.
- Connect the 8 ft Tachometer Harness (likely used for illumination power) as needed.
- Connect the AF/WB Throttle Position Harness according to the instructions for your specific PLX Devices controller and oxygen sensor. This harness will carry the air/fuel ratio signal to the gauge.
- Connect to PLX Devices Controller: Ensure the gauge’s signal wire from the AF/WB Throttle Position Harness is correctly connected to the output of your PLX Devices wideband controller.
- Configure Warning Light (if applicable): Follow the gauge’s or PLX controller’s instructions to set the desired air/fuel ratio thresholds for the warning light to activate.
- Power On and Monitor: Once all connections are secure, power on your vehicle. The gauge should illuminate and display the current air/fuel ratio. Monitor the readings to ensure your engine is operating within the optimal range.
BENEFITS OF USING THE SPEEDHUT 2-5/8″ PLX 10-18 AIR/FUEL GAUGE W/ WARNING (R25-WB8-REV):
- Accurate Monitoring: Enables real-time tracking of your engine’s air/fuel mixture for optimal performance.
- Optimized Engine Tuning: Provides wide-range AFR readings for fine-tuning and diagnostics.
- Enhanced Fuel Efficiency: Helps maintain an ideal fuel mixture, improving fuel economy.
- Engine Protection: The configurable warning light prevents damage by alerting you to dangerous conditions.
- Seamless Integration: Designed specifically for PLX Devices systems, ensuring reliable communication and installation.
FEATURES:
- Displays a broad spectrum of air/fuel ratios from very rich to very lean.
- Engineered to communicate effectively with PLX Devices wideband controllers.
- Includes a visual alert system for out-of-specification AFR values.
- Designed with a common diameter for straightforward mounting in various applications.
- Fits into a standard 68mm diameter opening.
- Operates on a 0-4 volt input signal from the wideband controller.
- Comes with a dedicated harness for tachometer/illumination power.
- Includes a specific harness for main power and gauge lighting.
- Features a harness designed for the air/fuel wideband signal and potentially throttle position input.





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