Those impact and roll-over switches can be purchased from some of the wiring kit companies, like Ron Francis. I got three of the switches at a Ford recycler for $5 each. The Ford switches are exactly the same as the very much more expensive one from Ron Francis.
If a person goes looking for this switch at an auto recycler, they will find in behind the passenger kick-panel. Two Philips screws hold the switch in place. A person taking this switch should consider taking a length of the Ford harness, with the correct electric connector.
https://www.ronfrancis.com/prodinfo.asp?number=CR%2D92 Just to make another bit of information clearer. The oil pressure electric power should operate a relay that will interrupt the power to the E-pump. The oil pressure circuit should not power the e-pump.