As explained previously have a combination of tacho failing and oil pressure warning lamp.

http://www.isham-research.co.uk/quattro/index.html

 

Got a fault tracing scheme in German from Address in post above
Verdict was Replace instrument panel
However I do have intermittent function.

There is nothing in fault tracing dealing with intermittent problems
There is evidently an acknowledged weak point. The question is where is it?

If I knew that I might be able to set up a work around. Any ideas anyone?
I have a couple of instrument panels to play around with.