Working Voltage: DC12V Signal Line Voltage: 0-1V Spiral: x 1.5 Use Wrench: 22mm Output Voltage: Maximum value 900mV, minimum value less than 50mV How to Connect the Gauge to Sensor: - The white line is for heater - Black line is signal line - Gray line is signal ground - The green wire of the instrument is connected to the black wire of the sensor - The gray line is connected to the negative terminal of the battery - One white wire connects to the car body or battery negative terminal - Another white wire connects to the ignition switch line - The white line is the heater and does not distinguish between positive and negative electrodes Response time: (600mV-300mV) less than 100ms Response time: (300mV-600mV) less than 100ms Start-up time: less than 10s Heating resistance: 8.5-9.5 ohm Internal resistance: 200-300 ohm Color: Black + White Material: Plastic Package Contents: 1 x Air Fuel Ratio Gauge 1 x Cable 1 x O2 Oxygen Sensor 1 x English Manual Note: Only the items listed above are included. Other products are not included. Note: Lighting and display differences may cause the color in the image to vary slightly from the actual product. Measurement error allowance is +/- 1-3 cm.