1Allows you to monitor your engines air to fuel mixture, ensuring it is at optimal levels, reduced emissions and better fuel economy. 2Easily installed with the color coded wire harness that lets you connect the gauge directly to your vehicles existing narrowband oxygen sensor. 3It will dim 30% for easier night time driving by simply connecting it to your factory headlight switch. 4With 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. 5Advanced manufacturing technology, high reliability and high performance.1 x Gauge1 x Instrument Holder2 x Power Cable1 x Instruction1 x Bracket4 x Tape3 x Short Screw1 x Long Screw with 2 NutsCondition: 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% 1Allows you to monitor your engines air to fuel mixture, ensuring it is at optimal levels, reduced emissions and better fuel economy. 2Easily installed with the color coded wire harness that lets you connect the gauge directly to your vehicles existing narrowband oxygen sensor. 3It will dim 30% for easier night time driving by simply connecting it to your factory headlight switch. 4With 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. 5Advanced manufacturing technology, high reliability and high performance.1 x Gauge1 x Instrument Holder2 x Power Cable1 x Instruction1 x Bracket4 x Tape3 x Short Screw1 x Long Screw with 2 Nuts