Here's what I measured on my '04.
I didn't find the actual oil pressure reading in the Tech 2 values; I thought it would say but I guess not. Here is what it read for sender voltages at various oil pressures as indicated by the dash gauge:
View attachment 355941
YMMV
Wonder if one could disconnect the oil pressure sending unit and send a small dc voltage to the gauge through the wiring harness connector? I'm not sure which pins would be the right ones to do that without looking at a wiring diagram.