Features: 1.Safe and high?quality plastic material, not easy to damage the car, avoid unnecessary losses. 2.Suitable for 12V, 4 / 6 / 8 cylinder and gasoline vehicle. Add the look and feel of a racing car to your riding, with light weight. 3.Easy installation using English user manual, professional installation is strongly recommended. 4.Perfect match for the original car. Can directly replace the broken or shabby one. 5.Car air fuel ratio gauge is an indispensable accessory for cars to ensure its normal operation. Specification: Item Type: Car Air Fuel Ratio Gauge Material: Plastic Color: Black shell, blue digital reading Input Voltage: 12V Air Fuel Ratio Meter: 20:1 - 10:1 Diameter: Approx. 52mm/2in 1.The goods include installation instructions in English. 2.It is suitable for 12V, 4 / 6 / 8 cylinder and gasoline vehicle Sensors that can be adapted: Oxygen Sensor Specification Working Voltage: DC 12V Spiral: M18 x 1.5 Use Wrench: Approx. 22mm/0.9in Output Voltage: Maximum value 900mv/ minimum value 50mv Response Time: (600mV - 300mV) 100ms Response Time: (300mV - 600mV) 100ms Starting Time: 10s Heating Resistance: 8.5 - 9.5 Internal Resistance: 200 - 300