Computer doesn't monitor oil pressure
Computer has a separate water temp "sensor" called the ECT, it has 2 wires hooked to it, the dash temp gauge uses a 1 wire "sender" to get temp.
Yes, you will need to locate the oil pressure sender on the block and add a "T" if you want to add a "real" oil pressure gauge, then small tube from "T" to gauge inside cab.
You can also use a PS60 oil pressure sender, Ford used these for many years when they had "semi-real" oil pressure gauges, this would be for an electric gauge, but not the stock gauge if it was setup for oil pressure switch, i.e. always reads "normal" pressure, doesn't go up and down with temp or RPM.