Audi 80 ABK engine

Hi all, more problems, oil light is coming on at random times and random
revs, I have put a pressure gauge on it and when hot at idle it reads 25 psi
and at 2000 rpm it reads 75 psi book says hot at 2000 rpm it must be at
least 2 bar ( 30 psi ) so I think its not actually an oil pressure problem
only a switch problem. what I do not understand is why is there 2 pressure
switches one on top and the other underneath the filter housing what is the
reason for 2, can anyone explain please? engine is 2.0ltr 8 valve ABK Audi
80 1994 year.

Rich

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