Features: 1.Allows you to monitor your engines air to fuel mixture, ensuring it is at optimal levels, reduced emissions and better fuel economy. 2.Easily installed with the color coded wire harness that lets you connect the gauge directly to your vehicles existing narrowband oxygen sensor. 3.It will dim 30% for easier night time driving by simply connecting it to your factory headlight switch. 4.With the color memory recall feature you don't need to worry about adjusting the color of your gauge every time you turn your vehicle on. 5.Advanced manufacturing technology, high reliability and high performance. Specification: Condition: Brand New_x000D_ Item Type: Air/Fuel Ratio Gauge_x000D_ Material: ABS_x000D_ Color: As picture shown_x000D_ 2 1/16 inch (52mm) black face gauge with a magnified lens_x000D_ Gauge Depth Measures 1 5/16 Inches_x000D_ Displays Lean, Rich, and Optimal Air/Fuel Mixtures_x000D_ Color Coded Wire Harness Connects to Your Vehicles Narrowband o2 Sensor_x000D_ 7 Color LED Through Dial Lighting with Color Recall Ability_x000D_ 7 Solid Color Settings and Two Color Cycle Modes_x000D_ Dimmer Wire Allows the Gauge to Dim 30% PackageList: 1 x Gauge1 x Instrument Holder2 x Power Cable1 x Instruction1 x Bracket4 x Tape3 x Short Screw1 x Long Screw with 2 Nuts