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1978 911SC Oil Pressure Gauge

Cables and Controls

Vehicle Information: Model: 911 SC Targa; Year: 1978; Body Type: Targa; Total Mileage: 130,000 +;

Recently I have begun to have problems with my oil pressure gauge.Several weeks ago the gauge was 'pegged' at 5 bar while drivingregardless of rpm. The gauge did drop to 1 bar at idle. Yesterday thegauge was very erratic. On idle the gauge will 'bounce' from 1 - 5 Bartapping on the stops at both ends. What could be the cause of theproblem? Ground, gauge or sender? How can I troubleshoot this problem?The oil level at normal operating temperature is fine. I normally keepoil level midway between hot marks on dipstick.

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