Features: 2-in-1 car meter shows the air-fuel ratio and battery voltage, accurate and easy to view. Made of high-quality plastics, with nice durability, strong and anti-aging. It can help improve vehicle performance and make driving safer. 52mm/2in universal gauge fits for 12.0V motorcycle, car, truck, gasoline engine. Easy to install and use, reliable quality, is a nice modification accessories. Specifications: Color: Black Material: Plastics Working Voltage: 12 V Signal Line Volatge: 0-1V Output Voltage: Max. Value900mV / Min. Value50mV Response Time: (600mV-300mV)100ms Response Time: (300mV-600mV)100ms Starting Time: 10s Heating Resistance: 8.5-9.5 Internal Resistance: 200-300 Mounting Diameter: 52mm/ 2in Item Size: 57 * 57 * 40mm/ 2.2 * 2.2 * 1.6in Package Size: 150 * 100 * 50mm/ 5.9 * 3.9 * 2.0in Package Weight: 300g/ 10.6oz Packing List: 1 * Air Fuel Ratio Gauge Kit1 1 * Oxygen Sensor 1 * Gauge Cable 1 * Manual