Feature: 1. 3 Units: Three units can be switched, km/h, miles/hour, knot (rounded to one decimals). GPS SOG: 0‑600km/h range; ODO: 0‑999999km range; Travel: 0‑999.9km range; COG: Ground course (orientation pointer). 2. Characteristic: Made of 316L stainless steel, speedometer can be used for a long time even in acid and humid environments. IP67 waterproof and dustproof grade, with curved glass (with antifog function). 3. Application: GPS speed meter is suitable for cars, tractors, trucks, boats, ships, motorcycles, etc. It can also be used for engine generator sets, construction machinery, agricultural machinery, etc. 4. Firmly Installed: There is a snap together with the harness connector, for best and firmly connected, the speed odometer could work even in strong viberation. 5. Diameter: Easy to install, open an 85mm (3 3/8in) diameter and 56mm (2 3/16in) deep hole, put the gauge in it, after connecting, it takes about 30 seconds to get signal in the first time. Specification: Item Type: GPS Speedometer Material: 316 stainless steel + ABS + PC Display Range: GPS SOG: Speed Over Ground: 0-600km/h ODO: Odometer: 0-999999km (Can be adjusted by the back button.) TRIP: 0-999.9km (Return Zero When off electricity.) COG: Course Over Ground (Orientation Pointer) Working Voltage: 9-32VDC Three Units Can Be Switched: Knot; Mph; Km/H Protection Class: IP67 Backlight: TFT Screen Input Parameter: GPS Signal Applicable Models: Universal for DC12V 24V vehicles, motor yachts, ships, RVs and other vehicle modifications Installation Steps: Step 1: Open a 85mm / 3 3/8in diameter round hole in your central control or other pre installation location Step 2: Put the meter into the opened round hole Step 3: Match the screw holes of the bracket to the screws on the back of the meter, then tighten the screws, and clamp the panel with the bracket and the bezel Step 4: Insert the power wiring harness directly into the back wiring port of the instrument, and then connect the corresponding sensor and wiring harness according to the distribution instructions, and then connect to the power supply.. Package List: 1 x Speed Gauge1 x Power Harness 1 x Speed Sensor1 x Manual