1、IP67 waterproof and dustproof grade, with excellent waterproof function, can work in water. 316L stainless steel can be used for a long time even in acid, alkali and humid environment. It has curved glass with anti‑fog function. 2、The LCD display clearly shows the mileage, has the characteristics of high indication accuracy, repeatability and versatility, reliability and stability, and relatively simple drive and control. Suitable for the modification of various vehicles, the stepper motor drives the pointer, which can accurately display the engine speed. 3、The stepping motor is suitable for the whole series of stepping instruments, with low power consumption, long life and high precision. With ultra‑wide working voltage design (long‑term working voltage: 9 ‑ 32V, maximum reach: 36V, (≤1 minute)). 4、The harness connector has a buckle to form the best and firm connection, The pressure gauge can also work normally under strong vibration. This product can be used for engine/generator sets, ships, construction machinery, agricultural machinery, automobile modification, etc. 5、It is suitable for car, boat, yacht, RV. The signal comes directly from the satellite signal receiver, also called GPS speed sensor. This instrument has the advantages of high accuracy, fast position confirmation, and short start‑up time. Item Type: Speedometer Material: Stainless steel 316L bezel + Anti-fog glassMounting Diameter: 85MM or 3 - 3/8in Indicating Range: 0 - 80MPH / 0 - 130KM/H Input Signal: GPS antenna Backlight Color: Red or blue Operating Current: ≤60MA Operating Temperature: -30℃ - + 75℃ Storage Temperature: -40℃ - + 85℃ Protection Grade: IP67, back cover is IP5 Installation Instructions: 1. Cut a hole Approx. 85mm/3.3in in diameter in the panel (your engine room panel and instrument panel) and insert the instrument into the hole corresponding to the panel marked with a bump and make a small notch in this position to ensure that there is at least Approx. 85mm (3 - 3/8in) instrument panel on the back of the instrument. 2. After the instrument is installed into the panel, screw it down with the retaining ring. 3. Connect the wire and the instrument housing is directly connected to a 12/24V power supply. 4. Insert the wire harness and secure it firmly on the table. How to Use: 1. Red wire connect positive pole, blue wire connect negative pole, black signal wire connect sensor, orange backlight wire connect positive pole. 2. Install the instrument on the instrument panel and then connect the power supply. 1 x GPS Speedometer 1 x GPS Speed Sensor 1 x Power Harness 1 x Manual