Check your oil, that's the only thing that would cause abnormal pressure aside from a bad oil pump I think. And you'd know if you had a bad oil pump. If your oil pressure was really low though your light would come on...

So the car still will not rev past a certain point in the rev range when it's warmed up? Does it just STOP like you've hit the fuel cut off? Maybe the ECU is bad or something, that's weird.