1999 Dodge Ram 1500 Laramie 8 Cyl 5.2L
Oil pressure fluctuates at higher rpm's
the pressure will climb up to the top of the operating range and sit there for a minute then it will drop back down to the middle then climb back up. only does it at higher rpm's, highway speeds.
Replace the oil pressure sending unit and see if problem is gone. This is a cheap part that is easily replaced.