RYSJM | Universal Digital Air-Fuel Ratio Gauge 52mm + AFR Narrowband O2 Oxygen Sensor AFR Display 0258006028 for 12V Car

Feature:- High Precision - Racing look enhance the characteristic to your car/vehicle - Fitment : Universal 52mm diameter Voltmeter fit for Motorcycle Car /Truck/ Gasoline Engine (The compatibility just for reference .Please make sure the item fit for your car before purchase.)Fitment:Fit most of 12Volt vehicle, Fit 2" or 52mm Diameter Gauge Pods holderApplication:Color:Black Voltage:DC 12V Diameter:52mm/2“ Material:Plastic Quantity: 1 SetPackage Included: （as the picture shows）1x Air Fuel Ratio Gauge 1x SensorO2 sensor instructions- The white line is at heater ab - Black line signal line C, gray line signal ground D - The green wire of the instrument is connected with the black wire of the sensor. - The gray line is connected to the negative pole of the battery. - One white wire connect with the car shell or battery negative pole. Another white wire connect to the ACC line of ignition switch - The white line is the heater and does not distinguish between positive and negative electrodes - About the air fuel gauge, please see the installation instructions.