ELING Waterproof Digital GPS Speedometer Odometer Trip Meter Course For Auto Marine Truck With Backlight 3-3/8 inches (85mm)

Open a 85mm dimension and 70mm depth hole, put gauge into it and fasten Hook up easily, 3 wires connection(power, ground, lighting). This is complete unit, can work directly with gps sensor together, not need other sensor cables. Mount the sensor at any position, on or under the dashboard. It takes about 30 seconds to get signal in the first time, but less than 3 seconds after that. It gets quicker under a clear view of the sky. Sometimes if signal is missing, pls. reconnect all wires and restart it. It shows Current Speed, Trip Meter(return to 0 after power off), COG, ODO(cannot be reset), Press the back button to adjust unit(KM/H. MPH, KNOTS) Red Backlight, 9-32VDC(12VDC/24VDC) Working Voltage, 100% Waterproof and anti-fogging protection