1995 A6,Warning lights on, Rev counter stops working (intermittent)

Hi
I have an Audi A6 Avant (1995 N reg). There is an intermittent fault where the oil light comes on and the rev counter stops working. Sometimes all the
warning lights come on with the rev counter still not functioning. After a period of time, which can vary, the warning lights will clear and the rev counter will start working again...
Already changed the oil pressure switch and tried new clocks, but fault remains...
Anybody any ideas what this might be?
Thanks
Rgds
Fraser
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James Ewen wrote:

I know in the late 80's and into the early 90's VAG used a dynamic oil pressure warning system with two oil pressure senders. There was one sender for idle which switched at a fairly low pressure, and one for higher engine speed, which switched at a much higher pressure. A small electronic circuit switched between these based on engine RPM. I friend owned two older VW's with this system, and he had intermittent failures in both. There was something wrong with the tachometer electronics that caused the oil pressure warning system to malfunction (light came on even though oil pressure was normal). I do not know if this applies to your '95.
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