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1980 911 SC Erratic Oil Pressure

Engine

Vehicle Information: Model: 911SC; Year: 1980; Body Type: Coupe; Total Mileage: 163,000;

My oil pressure and temperature has started jumping up and down. The mechanic checked it with a mechanical gauge and said it is not the sender. The car seems to be running good. The temp goes up when driving as the O.P. gauge needle pumps erraticly up and down. As soon as I come to a stop the temp goes back to normal. While driving the temp gauge jumps around a bit but not as much as the O.P. I had noticed that the O.P. seemed to reading low before the problem started. By low I mean the clod start was normal but at regular running temp it was reading 2 at 4000rpms, at idel 0. The temp seems to be OK.

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