GlowShift’s Black 7 Color Series Dual Digital Wideband Air/Fuel Ratio Gauge allows you to closely monitor the left and right banks of any vehicle’s exhaust system simultaneously from one gauge on an ultra-bright 4-digit color changing LED display. Choose between 7 Solid Color Settings including Blue, Green, Red, Teal, Yellow, Purple and White. You can also 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 dual wideband AFR 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.