Test speedometer? and transmitter?
 

My speedometer is not working at all… Since the wiring, gearbox and speedometer are from different cars I don’t know where to start fault tracing. I think the wiring is right with + connected to + :) and the two cables from the transmitter connected to the two bottom connectors (the one in the bottom also have earth to it).

Is there some why that I can test the speedometer? And the same for the transmitter in the gearbox?

Switch a muli meter to measuring ohms and connect both sensor terminals. Jack up the rear of your car so both wheels can turn free. Turning a wheel should give you eight pulses per revolution on the multi meter (Switch between low and high ohm value).

- Manfred

Thanks, I will try this!