Many thanks for your replies. I was not able to read them up to now. So sorry for being late. Up to the „repair“ it always showed „0“ and only went to the right while running. Now it jumps to the left, as soon I start the engine, but works correct from the new „0“. As I understand: Going left - turb...

The board was out for changing the lights. Being in again, I see the boost gauge going to the left, as I start the engine and back, as soon the engine stops. It shows normal function, but twistet to the left.