GlowShift’s Tinted 7 Color Series Digital Wideband Air/Fuel Ratio Gauge is essential when tuning any performance vehicle. This digital wideband gauge allows you to closely monitor your car or truck’s Air to Fuel Ratio on an ultra bright 4-digit color changing LED display. Select either Gasoline AFR readings from 10.01 to 20.00 AFR, E85 readings from 6.660 to 13.31 AFR, or LAMBDA readings from 0.683 to 1.365. With this gauge you’ll have the ability to carefully map out your vehicle’s Air to Fuel Ratio through the range of engine RPM. Benefits include maximized power and engine performance.