1、Characteristic: Three unit can be switched, that is km/h; mph; knot(rounded to one decimals). TFT screen, displays the range clearly, and 9‑32VDC 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. Item Type: GPS Speedometer Material: 316 stainless steel +ABS+PC GPS SOG: Speed Over Ground: 0-600km/h ODO: 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: 9-32VDC Three Units Can Be Switched: Knot; Miles Per Hour; Kilometers Per Hour Protection Level: IP67 Backlight: TFT Screen Input Parameters: GPS Signal Fitment: Universally used for DC12V/24V vehicles, motorcycles, yachts, ships, RVs and other vehicle modifications 1 x Speed Gauge 1 x GPS Speed Sensor 1 x Power Harness 1 x Manual