I've ordered the new VR and sure hope it fixes the car. Yesterday with the AC on the accessory voltmeter I bought occassionally showed less than 12v at idle.
About the gauges - I don't know about Porsche specifically but most modern cars don't operate the gauges from directly connected sensors. The gauges are controlled by the ECU, which decides what position to point the needle based on the sensor reading but the ECU is programmed to avoid alarming the driver with mildly high readings (temp) or low readings (oil & volts). The ECU puts the needles in pleasantly reassuring positions unless the underlying system gets really bad.
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