1、The signal comes directly from the satellite signal receiver (GPS speed sensor), high precision, quick location confirmation and short start up time. 2、With the IP67 waterproof and dustproof grade, the speedometer has high dustproof ability, equipped with curved glass (with anti‑fog function). 3、The speedometer has ultra‑wide working voltage design (long‑term working voltage is 9‑32V, the maximum is 36V (≤1min). 4、The stepper motor is suitable for the most instruments, has the function of low power consumption and long life, higher precision. 5、It is very suitable for all vehicles, boats and all‑road vehicles, such as car, boat, yacht, motorcyle and so on. Item Type: GPS Speedometer Material: Stainless Steel 316L Bezel + Anti-Fog Glass Install Diameter: Φ85mm or 3-3/8in Indication Range: 0-35knots, 0-40mph Backlight Color: Red, Green, Blue, White, Yellow, 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 Input Signal: GPS with Antenna Working Current: ≤100mA Operating Temperature:-30℃-+75℃ Storage Temperature: -40℃-+85℃ Grade of Protection: IP67 Speed Odometer Use Stepping Motor Drive Pointer, Can Show the Speed of Engine Precisely, and Also Can Show The Mileage Clearly with LCD Display Screen Function Introduction: Press the Gauge Back Mode Button 3 Second Continuously, Then You Can Select Digital Display Mode Set, Press Mode Button Again,You Can Select Trip 1, Trip 2 and COG 3 Kinds Different Display Method, But They Can Not Show at the Same Time. Trip 1: Short Mileage, Data Will Not Be Recorded After Power Off Trip 2: Short Mileage Data Will Be Recorded After Power Off, Users Can Hold the Set Button for 3-5 Seconds to Clear COG: Show Azimuth Angle, Data Will Not Be Recorded Remarks: The Unit of Trip, Total Mileage and Outta Unit of Dial Are the Same The Below is Odometer Function, It Will Record Total Mileage Automatically: Pls Note: For This Speedometer, We Suggest Buyers to Connect GPS Antenna Firstly and Then Connect Power (Can Not Connect Power Firstly and Then Connect GPS Antenna), Otherwise It Will Be Easy to Make GPS Mould Damaged Install Instruction: Opening a hole in the panel (your cabin board and dashboard) with a diameter of 85mm, insert meter into the hole, the panel corresponding to the instrument panel is marked with a convex table, and open a small notch in this location, to ensure that there is at least 85mm (3-3/8in) of the instrument panel at the back of the instrument After the instrument is mounted in the panel, screw down with a fixed ring Connect the wire, the instrument housing is directly connected to the 12/24V power supply Insert wire harness, firmly locked in the tableWiring Instructions: Red wiring - Positive Blue wiring - Negative Orange wiring - Backlight 1 x GPS Speedometer 1 x GPS Speed Sensor 1 x Power Harness 1 x Manual