Originally Posted by 2004fx4f150
Im going to put a mechanical gage on this weekend.
Before spending money on a mechanical gauge and figuring out how to add it in, you might want to just try replacing the OEM sending unit to see if it's the problem. It's a cheap part (under $20 for my truck). It's basically a NPT threaded adapter with an electrical plug on the back, assuming they didn't change too much about it in the 3V engines. Drain the oil and access to the sensor is easiest while the oil filter is off.
BTW, Ford lists the part as an "Engine Oil Pressure Switch".