Working voltage: 12VSignal line voltage: 0-1VSpiral: M18*1.5Use wrench: 22mmOutput voltage: Maximum value ≥900mv/mv/mv/mv/mv/mv/mv 1: (600mV-300mV) ≤100msResponse time 2: (300mV -600mV) ≤100ms Start-up time: ≤10s Heating resistance: 8.5~9.5Ω Internal resistance: 200~300Ω1.Air-fuel ratio gauge is suitable for 12V gasoline vehicles,LCD display digital pointer and can change 7 colors, very gorgeous.2.The oxygen sensor is suitable for Oxygen Sensor Specification:OEM:0258006028Working Voltage: 12VSignal Line Voltage: 0-1VSpiral: M18*1.5Use Wrench: 22mmOutput Voltage: Maximum value ≥900mv/ minimum value ≤50mvResponse time: (600mV-300mV) ≤100msResponse time: (300mV -600mV) ≤100msStarting time: ≤10sHeating resistance: 8.5~9.5ΩInternal resistance: 200~300ΩConnection :The green wire of the gauge 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.About the air fuel gauge, please see the installation instructions.Note:1.Highly Recommended professional installation,do not teach you how to connect the O2 Oxygen sensor.2.This kit is not a universal kit, please confirm whether this oxygen sensor is suitable for your car before buying, thank you!