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. Condition: 100% Brand NewItem Type: Air/Fuel Ratio GaugeMaterial: ABSColor: As picture shown2 1/16 inch (52mm) black face gauge with a magnified lensGauge Depth Measures 1 5/16 InchesDisplays Lean, Rich, and Optimal Air/Fuel MixturesColor Coded Wire Harness Connects to Your Vehicles Narrowband o2 Sensor7 Color LED Through Dial Lighting with Color Recall Ability7 Solid Color Settings and Two Color Cycle ModesDimmer Wire Allows the Gauge to Dim 30% 1 x Gauge1 x Instrument Holder1 x Sensor2 x Power Cable1 x Instruction1 x Bracket6 x Tape6 x Short Screw1 x Long Screw with 2 Nuts