Feature: 1. Universal GPS Speedometer: Applicable for all cars, tractors, truck, motorcycle, racing, etc, accurately measures the travelling speed and mileage of vehicles and boat. The GPS Speedometer signal comes directly from the satellite signal receiver (GPS Speed Sensor). 2. Installation Note: For the GPS antenna, you should securely fasten it in the flat position, black side upwards, preferably outside (or inside front windscreen) so that it has a clear view of the sky to pick up satellite signal. Connect the antenna cable to socket in the back of the gauge. And do not cut cable. 3. 3 in 1 Gauge: The GPS speedometer combines speed tracking, voltmeter, and fuel gauge in a single device for precise, multifunctional monitoring on boats, RVs, and trucks. 4. Installation Size: With 85mm (3-3/8in) install diameter, this GPS speedometer odometer is easy to integrate into a variety of vehicles and vessels. 5. Easy to Read: Featuring a 7 color backlight, this GPS speedometer ensures easy readability in all conditions, making it a practical choice for day and night use. Specification: Item Type: 3 in 1 GPS Speedometer Voltage: DC 9-32V Speedometer: 120MPH Voltage Meter: 8-16V Fuel Gauge: E 1/4 1/2 3/4 F Backlight: Seven Color Fitment: Motorhomes, Yachts, Trucks. Package List: 1 x Speedometer 1 x User Manual 1 x GPS Wiring Harness