2 in 1 Meter 52MM Narrowband Digital Air Fuel Ratio Gauge Kit 12 V Car M4A8
52mm/2in universal gauge fits for 12.0V motorcycle, car, truck, gasoline engine. 1 Air Fuel Ratio Gauge Kit1. 1 Oxygen. 1 Gauge Cable. Signal Line Volatge: 0-1V. It can help improve vehicle performance and make driving safer.