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Volt Meter Adjustment


Vehicle Information: Year: 1985; Engine (size, modifications): 5L; Total Mileage: 105K; Transmission type: Autotomatic;

The voltage meter in my 928 reads a little over 12v most of the time. When I turn on the a/c and head lights it goes below 12, but, at the battery the voltage read 13.8v all the time.I checked the alternator with an oscilloscope. I got a bad wave pattern, so I replaced the alternator. Same volt meter and battery reading as before.I removed the instrument cluster and cleaned the connections. Same problem. The battery voltage checks good. Is the dash voltage meter accurate? Is it adjustable?

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