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 Item Type: Air/Fuel Ratio Gauge Material: ABS Color: As picture shown 2 1/16 inch (52mm) black face gauge with a magnified lens Gauge Depth Measures 1 5/16 Inches Displays Lean, Rich, and Optimal Air/Fuel Mixtures Color Coded Wire Harness Connects to Your Vehicles Narrowband o2 Sensor 7 Color LED Through Dial Lighting with Color Recall Ability 7 Solid Color Settings and Two Color Cycle Modes 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