GlowShift Black 7 Color Narrowband Air/Fuel Ratio AFR Gauge - Lean, Optimal & Rich Readings - Black Dial - Clear Lens - 2-1/16" 52mm 2 1/16 Inch (52mm) Black Face Gauge with a Magnified Lens Displays Lean, Rich, and Optimal Air/Fuel Mixtures 7 Solid Color Settings and Two Color Cycle Modes with Dimmer Function that Allows the Gauge to Dim 30% Color Coded Wire Harness Connects to Your Vehicles Narrowband o2 Sensor Free Lifetime Technical Support & One Year Limited Warranty