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Intermittent oil pressure gauge failure

Electrical and Electronic

Model: 911, Year:2002, Mileage:32000, Type of use:Street use only
Warning message indicates the oil pressure gauge has failed and it drops to zero. Then it bounces back to max and only comes down to 3 when warm and idling. Is this a problem with a loose wire, sending unit or gauge? Is there an easy way to check?

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