At idle, 20 - 30 psi is adequate, 35 or so is very good.
you will need to hook a pressure gauge up to the fuel rail. If the correct pressure is not obtained then the pump is bad. If too much pressure then your fuel pressure regultor is not working. You will need to find out what the normal operating PSI range is for this pump first.
Remove the oil sending unit and install a mechanical gauge. Start the engine cold and let it warm up to normal operating temperature. It the oil pressure is correct then replace the oil pressure switch.
The regulator is part of the pump module in the fuel tank on a 1999 Dodge Dakota.
That would be the pressure plate.
40psi40psi
100-125psi
Not enough oil.
Mopar ATF+4
the low pressure port is right on top of the comperssor
39 or 49 psi, depending on the year.
It's to the right of the distributor.
it is built into the fuel pump module, and caontrols the fuel pressure to the engine