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: Blue 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: 0200MPH Suitable for car truck boats off-roadvehicles boats. 2 Gauge Set 0-200MPH GPS Speedometer 0-8000rpm Tachometer for Auto Boat Blue LED. 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. This speedometer with left and right turn signals and high beam. Material:stainless steel 316L bezel+anti-fog glass. 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). 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. 1 x GPS speedometer. 1 x GPS Receiver. 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.