speedometer

My plan was to use a mechanical speedometer and cable from the ZF 25-2 transaxle . I wonder if there are senders to connect on the ZF ? and use a digital speedometer. I have to use a speedometer with km not mph, the authorities require this. Someone out there with a good idea ? Rune

Can anyone help me with info on a pro mechanic in or around Los Angeles area for general servicing and one issue I have with a speedometer not working (I've figured out so far that it is not the actual Speedometer, it's a cable issue). I don't know enough about car to fix myself, need to find...