What problem would cause the oil gauge to be high on a 996 Porsche the oil levels are all ok. could it be an electrical problem?

I'm not sure if this is your issue but the "oil pressure" gauge should max out (about 5 Bar) when the engine is cold and first started. Porsches use fairly reliable VDO gauges! As your oil warms up the pressure should settle halfway (2.5 bar on one of my Porsches and 3 bar on the other). If the pressure gauge is stuck at 5 bar all the time, then chances are the sender unit needs replacement or cleaning.