RYSJM | 52mm Digital Air Fuel Ratio Gauge Narrowband O2 Oxygen Sensor Car Gauge AFR Fit for 12V Car Voltmeter 2 in 1 Meter Voltage

52mm Digital Air Fuel Ratio Gauge With Narrowband O2 Oxygen Sensor Car Gauge AFR Fit for 12V Car Voltmeter 2 in 1 Meter VoltageFeature:- 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 gasoline vehicle,Fit 2" or 52mm Diameter Gauge Pods holderApplication:Color:BlackVoltage:DC 12VDiameter:52mm/2“Material:PlasticQuantity: 1 SetPackage Included: （as the picture shows）1x Air Fuel Ratio GaugeOR1x SensorOR1x Gauge CupNote: The gauge cup needs to be purchased separately, the gauge does not contain the gauge cup ! !O2 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.