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oil temperature gauge short?

Electrical

Model: 911S, Year:1977, Mileage:150000, Type of use:Street use only
After a hot day of stop & go traffic to Lime Rock Park, the oil temp gauge was reading just over 120c.After enjoying the race and ready to leave, as soon as I turned on the ignition the temp gauge pinned at 175. After starting the engine still pinned at 175 and oil pressure gauge did not move at all, stayed at zero.Drove home with no issues at all, all seemed fine except for the guages.I next replaced both gauges and still have the same issue. Even when the leads to the gauges are removed, as soon as the ignition is turned to on, the temp gauge pins to 175.Any ideas what to look for? Short? broken wire?ThanksRichard

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