lately the pressure in my z has dropped. its usually 30 idle and 60 reg driving with the castrol german made 0w30 but the last week it has dropped to 20 idle and 50 reg driving. why is this car hs new sender for oil press and no cam on a 65k mile motor. could it be the pump or gauge. thanks for your help in advance.

 

I don't know what the weather is like where you live, but around here it's warmed up quite a bit in the last week, and my oil pressure always drops a little in warm weather compared to cold weather, as the coolant gets a little hotter. Maybe ~5 pounds difference. Those pressures you have now don't sound bad at all though.