https://item.taobao.com/item.htm?id=548311391329Product name: GPS car speed speedometer ship speedometer
Hole installation diameter: 85mm. Dial diameter 90mm
Instrument function: direct speed display, short mileage, total mileage
Short mileage function: It can display the number of kilometers to the next station, and the number will be cleared after power failure.
Total mileage function: cumulative total kilometers or speed in knots