GlowShift Elite 10 Color Narrowband Air/Fuel Ratio AFR Gauge - Lean, Optimal & Rich Readings - Black Dial - Tinted Lens - Peak Recall Function - 2-1/16" 52mm 2 1/16 Inch Black Face Gauge with a Magnified Tinted Lens Displays Lean, Rich, and Optimal Air/Fuel Mixtures Peak Recall Ability & Audible/Visual Programmable High and Low Warnings 10 Color LED Through Dial Lighting with Color Recall Ability & Dimmer Wire Allows the Gauge to Dim 30% Mounting Hardware, Installation Instructions, Free Lifetime Technical Support, & One Year Limited Warranty