Ressurecting this thread Joeh, I have the same issue at the moment. I'm trying to work out whether it's the cluster or the sensor, the cluster seems to test ok in it's diagnostic mode, and I also seem to have a signal coming from the sensor/abs controller (but haven't tested with a consult machine)I have a spare dash cluster you're welcome to try if you get stuck, the only thing is that the RPM doesn't work on it
Generally it's either the speed sensor or the dash that fails, not sure if there are any fuses relating to the gauge either.
The best way to confirm would be to read the live data from the ECU to see if any speed is being registered, if there is then it's most likely the dash.