Feature:1. GPS speedometer, lower power consumption, longer life, higher accuracy, fast position confirmation, and short startup time.2. Display speed (unit KM/H), GPS and total accumulated mileage. The total mileage will be saved when power is off.3. Wide range of applications, suitable for ships, yachts, outboard motors, automotive, engineering machinery, motorcycles.4. Highquality ABS+316 stainless steel + mirror tempered glass, strong and durable. IP67 waterproof rating, not easy to damage.5. The installation is simple, just open a 85mm (3 3/8 in) hole on the dashboard, and leave 55mm (2 3/16 inch) behind the panel to fit the meter.Specification:Item Type: GPS SpeedometerMaterial: ABS+316 Stainless Steel + Mirror Tempered GlassDial Diameter: Approx. 79mm/3.1inInstallation Diameter:Approx. 85mm/3.3inWiring:Black: Ground(-)Red: 9-32VDCYellow: Backlight.Package List:1 x Speedometer1 x GPS 1 x English Installation Manual