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2002 996 Oil Failure Indicator message ignition on and engine off

Engine

Vehicle Information: Model: 996; Year: 2002; Body Type: Cabriolet; Total Mileage: 75,000;

I had intermittent oil failure indicator message show up when the pressure gauge suddenly whent from 5 bar to 0. I had the oil pressure sender replaced. Soon after the sender was replaced I now get the oil failure indicator message when the ignition is on and the engine is off. It has happened twice since the sensor replacement. The car runs great, no oil leaks, oil level is normal, not a high level of oil consumption and I drive it every day, the coolent temp is straight up after engine is warmed up. The oil pressure reading with the new sender or old worked as followed: cold start the gauge would go immediately to 5 bar, after the engine warms up about 8 miles of driving the gauge would slowly drop to 4.5 bar. The pressure typically at idle is 1.5 to 2.0 bar at around 2,000 rpm steady throttle 2.5 - 3 bar and at 3,000 rpm 3.5 - 4.0 bar and above 3,000 rpm about 4 bar to 4.5 bar. Is it possible to use an external pressure gauge to isolate the sender from the instrument cluster? The technician told me that my car when warmed up behaved differently than all other porsche 996 they see, at 2,000 rpm the readings are typically 5 bar. The technician said I should think about trading it in due to possible engine problem???? The engine in this car was replaced with a new one under warranty by the porsche dealership with about 32,000 miles on the car by the previous owner. The new engine is a 2004 year and it is a new motor not rebuilt. I will bring the car in again to check the cause of the latest fault, I cannot find any posts with this specific problem. Any suggestions??

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