I run a light power wire (14 ga. if I recall correctly) with a 3 amp fuse from a power supply to a toggle switch in the dash, then to the oil pressure switch, then to the trigger post on the relay. Run at least a 12 or better 10 ga. wire (that is fused) from your power supply to the relay and then the same 10 or 12 wire to your fuel pump. Good ground also.

According to what you say the NC to the starter solenoid and the NO to the ignition wire, you are feeding power from both sides of the switch. One side of the switch needs to go to the relay post that triggers the relay on. The other side needs to go to a power supply.

Wiring is not my specialty. Not at all. So forgive me if I made any errors in terminology, etc.