Working Voltage: DC12V Signal Line Voltage: 0-1V Spiral: x 1.5 Use Wrench: 22mm Output Voltage: Maximum value equal 900mv/ minimum value less than equal 50mv. How to Connect the Gauge to Sensor: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 Response time: (600mV-300mV) less than equal 100ms. Response time: (300mV -600mV) less than equal 100ms. Starting time: less than equal 10s Heating resistance: 8.5-9.5ohm Internal resistance: 200-300ohm Colour:Black&White Material:plastic Package Contents: 1 x Air Fuel Ratio Gauge 1 x Cable 1 x O2 Oxygen Sensor 1 x English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.