Speed odometer use stepping motor drive pointer, can show speed precisely, and also can show the mileage clearly with LCD display screen Specifications: Name:GPS Speedometer Material:stainless steel 316L bezel+anti-fog glass Panel color:Black Backlight Color: Red (default)? Totally 7 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 Fixing dimension: 85mm(3-3/8) Working voltage:932VDC Working current: =100mA Operating temperature: -30°75° Storage temperature:-40°85° Levels of protection: IP67 Indicating Range: 35Knots/40MPH Suitable for car truck boats off-roadvehicles boats. 2 Gauge Set GPS 35Knots 40MPH Speedometer 8000rpm Tachometer 7 Colors LED Black. 2 Gauge set:Speedometer and tachometer. Speed odometer use stepping motor drive pointer, can show speed. And also can show the mileage clearly with LED display screen. Material:stainless steel 316L bezel+anti-fog glass. Totally 7 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. Fixing dimension: 85mm(3-3/8). Levels of protection: IP67. Suitable for car truck boats off-roadvehicles boats. The adjustment range of speed ratio:0. This tacho must be hooked up to the “W” terminal on vehicle alternator. Many diesel engines and most inboard gas boat engine alternator have this connection. It can also be working with tachometer sender. Protection grade is IP67, the whole body is completely waterproof. 100% brand new and high quality. With polarity reverse protection function. The durability is good, and the seismic performance is good. Signal comes directly from the satellite signal receiver(GPS Speed Sensor). The gauge has the advantages of high precision, quick location confirmation and short start up time. With ultra-wide working voltage designlong-term operating voltage: 932V, Maximum up to:36V(= 1 min). 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 ti. 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 35 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 (ODO) 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. 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 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 table. 1 x GPS speedometer. 1 x GPS Receiver. 2 x Installation Instruction. If you need other speedometer see. If you receive defective item, please kindly notify us within 30 days. We are factory that majored in all kinds of gauges, car parts and accessories. We also can offer DIY service per your request. Our offer was reasonal and fair. You are welcome to send a message to us for cooperation opportunities and we will reply timely as long as we can see it. Red, green, blue, white, yellow, yellow green, orange, Purple.