Hi,
A little update...
First attempt was, to re-enter the speedometer-code. After that my mechanic swapped the instrument itself with a working one, and then, the black box, that's located in the engine compartment's fuse box.
Unfortunately, all without a result. My car is now scheduled for further troubleshooting for the 22. June.
Meanwhile I asked Mr. Baldwin from the factory for assistance. He already very kindly helped me with my lost ignition key, and the anti-tramp bar, so I'm confident that he will have a solution for me also this time.
I keep you informed.
Sunny greetings,
Ivo