As they are GPS based they work differently to a speedo linked to the wheels. In general mine is very accurate & certainly more readable than the speedo which is on the passenger side & under the tonneau.
It is powered via the radio USB slot. so when the power is off it is off.

I got mine from ebay for under £16. You can also get GPS speedo apps for your phone.


JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger