Dodge Ram Oil gauge-pressure...Help

Before you pull the pan , check the sender and the wiring. Does it make noise when the pressure drops off? I have the 5.2 in mine and at 170,000 it has a slight tick at start up but holds a constant 45 psi no matter what.
The sender is behind the passenger side head.
Mine is a 4x4 and I could easily take the pan off.