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1988 944S Oil pressure mystery

Engine

Vehicle Information: Model(924/944/968): 944S; Year: 1988; Body Type: Coupe; Total Mileage: 143,000;

My dilemma- oil pressure gauge pegs at 5 bar right at startup and stays there regardless of engine/oil temp. I have suspected the sending unit in the cooler housing and the gauge in the dash cluster (both of which I have swapped out with another and had the same result.)Although the car runs fine it's a little unnerving because; 1.- I wonder if something bad is going on right now and, 2.- I want the gauge to work properly if something IS going wrong later!How do you check to see if the wiring is intact? Do you have any other recommendations/caveats?

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