hud gps obd computer car speed projector digital speedometer display fuel consumption temperature gauge diagnostic tool

t600 gps speedometer display: speed, time, voltage, instant travel distance p10 obd speedometer display: speed, rpm, water temperature,voltage,fuel consumption, coolant, odo gps speedometer disadvantage: can't show fuel mileage and other obd data obd speedometer disadvantage: oonly works with latest cars with obd2 port gps speedometer advantage: wide apply for all vehicles obd speedometer advantage: could read all engine data as long as the engine protocol open