CammedTA

I have a CEL on my 09 G8 Gt , Code PO521. We hooked up a gauge to it , reading 23 psi at idle but when you rev it goes to 50 psi. The sensor on the cars reads the same. The motor sounds fine nothing seems to be wrong. I checked for the little filter under the oil pressure sensor it was already removed. What the hell else could be causing the CEL? P.S. I want to go supercharged but this holding me up from proceeding with it.