Feature 1Universal 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). 2Installation 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. 33 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. 4Installation Size: With 85mm (3-3/8in) install diameter, this GPS speedometer odometer is easy to integrate into a variety of vehicles and vessels. 5Easy 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.Item Type: 3 in 1 GPSSpeedometerVoltage: DC 8-16VSpeedometer: 120MPHVoltage Meter: 8-16VFuel Gauge: E 1/4 1/2 3/4 FBacklight: Seven ColorFitment: Motorhomes, Yachts, Trucks .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Speedometer1 x User Manual1 xGPSWiring Harness