Feature: 1. Red, green, blue, white, yellow, olive, orange, purple, a total of 8 different backlight colors, it will automatically change every 1 minute, also can be passed press Settings button to set your favorite color . 2. Has excellent waterproof function, can work in water. IP67 waterproof and dustproof grade, 316L stainless steel, can be used for a long time in acid‑base and humid environments, curved glass with anti‑fog function. 3. It is suitable for the modification of various vehicles. It uses a stepping motor to drive the pointer, which can accurately display the engine speed. The LCD display clearly shows the mileage, high indication accuracy, repeatability and versatility, reliability and stability, relative driving and control Simple features and so on. 4. The stepping motor is suitable for the whole series of stepping instruments, with low power consumption, long life and high precision. Ultra‑wide working voltage design (long‑term working voltage: 9 ‑ 32V, maximum reach: 36V (≤1 minute)). 5. The wire harness connector has a buckle, which has the best and firm connection, so that the pressure gauge can work normally under strong vibration. This product can be used for engine/generator sets, ships, construction machinery, agricultural machinery, automobile modification, etc. 6. Suitable for all vehicles, ships and all‑terrain vehicles, the signal comes directly from the GPS speed sensor, which has the advantages of high accuracy, fast position confirmation, and short start‑up time. Specification: Item Type: SpeedometerMaterial: Stainless steel 316L bezel + Anti-fog glassGPS Speedometer Fit for: Auto, boat, motorcycle, yacht, RV etc. Install Diameter: 85MM or 3 - 3 / 8in Indicating Range: 0 - 999 (MPH, Knots, KM/H adjustable) Connection Method: Row insert .Backlight Color: Red, green, blue, white, olivine, orange, purple, totally 8 kinds different backlight color, it will change automatically every 1 minute, or you can fix only one color that you like through press the gauge back "set" button. Working Voltage: 9 - 32V (12V / 24V) Input Signal: GPS with antenna Working Current: ≤100MA Operating Temperature: -30℃ - + 75℃ Storage Temperature: -40℃ - + 85℃ Grade of Protection: IP67, back cover is IP5 Gauge Function Introduction:1. SOG means speed over groud, ODO means total mileage, MPH means mile, Knots means sea mile, Km/h means kilometre.2. Press the gauge back black button,you can select knots, mph, km/h anyone that you need to display and save automatically.3. Press the gauge back button for about 10 seconds, you can select COG, ODO, TRIP anyone that you need to display, but can not select all to display at same time.Trip: Short mileage, data will return to zero after power off. ODO: Total mileage, data will be recorded after power off. Installation Instructions: 1. Cut a hole 85mm or 3 - 3 / 8in 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 85mm or 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 wiring to positive, blue wiring to negative, orange wiring to backlight.2. Install the instrument on the instrument panel and then connect the power supply. Package List: 1 x GPS Speedometer Odometer1 x GPS Speed Sensor1 x Power Harness1 x Manual