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Flucuating Oil Pressure Gauge

Engine

My 02 996 Turbo has started doing something rather odd. I hadn't driven it for three weeks and took it out one evening. After about a ten mile quick ride, on the way back home the oil pressure gauge went to ZERO for about 1 second, dash lights went on. Then immediately went to 5 bars of pressure. The car has oil in the middle of the oil level range and when started it displays about three bars at idle and three to four.five at engine speeds of 3-4K RPM. After driving for a while, it now registers five bars at all engine speeds above idle. Is the gauge bad, the pressure sensor/sender?

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