Feature 13 in 1 Multifunction: The GPS speedometer combines speed tracking, voltmeter, and fuel gauge in a single device for precise, multifunctional monitoring on boats, RVs, and trucks. 2Installation Size: Cut a 110 mm (4-3/8in) diameter panel hole. You will need a minimum clearance of 55mm (2 3/16in) behind the panel to fit the gauge. Put the gauge in the hole and screw down. 3Easy to Read: Featuring a red backlight, this GPS speedometer ensures easy readability in all conditions, making it a practical choice for day and night use. 4Installation 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. 5Enduring Construction: Made with premium metal and an HD mirror, this marine speed gauge ensures long lasting performance and easy maintenance in challenging marine environments.Item Type: 3 in 1GPSSpeedometerVoltage: DC 9-32VSpeedometer: 0-200KM/HVoltage Meter: 8-16VFuel Gauge: E 1/4 1/2 3/4 FBacklight: RedFitment: 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