Have you tried testing with a temporary mechanical gauge to be sure of the actual pressure? Even if you replaced the sensor, the gauge could still be faulty and/or mismatched to the sensor if the sensor has the wrong resistance range.
Also, does the oil pressure decrease when the engine is warm? And what grade of oil are you using?
For what it's worth, VW diesel engines have long been known for running very high oil pressure after cold startup if a heavy (like 15W40) oil is being used. Stories of leaking or exploding oil filters on cold mornings are part of the legend, especially back when the cars were newer and synthetic oils were not commonplace. The pressures you are seeing might be normal for a healthy/tight engine when started cold if using a heavyweight conventional oil in the crankcase.
The engines prefer synthetic oil and most of us like to use a 5W40 weight. Some even use a 0W40 or 5W30 depending on ambient conditions and what is available. Either of those should result in less extreme pressures after cold start due to their lower cold viscosity, if what you have right now is a 15W oil.
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