Feature:1. Characteristic: Three unit can be switched, that is km/h; mph; knot(rounded to one decimals). TFT screen, displays the range clearly, and 932VDC working voltage.2. Application: GPS speedometer fits for car, tractor, truck, boat, marine, motorcycle etc, and can be used for the engines generating units, ships, construction machinery, agricultural machinery, automotive modification, etc.3. IP67 Waterproof: Made of 316L stainless steel, speed gauge can be used for a long time even in acid base and humid environments. IP67 waterproof and dustproof rating. with curved glass (antifog function).4. Firmly Installed: There is a snap together with the harness connector, for best and firmly connected, the gauges could work even in strong viberation.5. Easy to Operate: Open a 85mm (3 3/8in) and 55mm( 2 3/16in) depth hole to put the gauge into it. After connection, it takes about 30 seconds to get signal in the first time. It gets quicker under a clear view of the sky.Specification:Item Type: GPS SpeedometerMaterial: 316 stainless steel +ABS+PCGPS SOG: Speed Over Ground: 0-600km/hODO: Odometer: 0-999999km (Can Be Adjusted By the Back Button)TRIP: 0-999.9km (Return to Zero After Power off.)COG: Course Over Ground (Orientation Pointer)Working Voltage: 9-32VDCThree Units Can Be Switched: Knot; Miles Per Hour; Kilometers Per HourProtection Level: IP67Backlight: TFT ScreenInput Parameters: GPS SignalFitment: Universally used for DC12V/24V vehicles, motorcycles, yachts, ships, RVs and other vehicle modifications.Package List:1 x Speed Gauge1 x GPS Speed Sensor1 x Power Harness 1 x Manual