Working Voltage: DC12V Signal 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 is at heater Black signal C, gray signal ground D The green wire of the instrument is connected with the black wire of the sensor. The gray is connected to the negative of the battery. One white wire connect with the car shell or battery negative . Another white wire connect to the of ignition switch The white is the heater and does not distinguish between and negative electrodes Response time: (600mV-300mV) less than 100ms. Response time: (300mV -600mV) less than 100ms. Starting time: less than 10s Heating resistance: 8.5-9.5ohm Internal resistance: 200-300ohm colour:Black+white Material:plastic Package Contents: 1 x Air Fuel Gauge 1 x Cable 1 x O2 Oxygen Sensor 1 x English manual Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.