Still sounds like new oil pressure switch is faulty, should be open/no power with no pressure. Then back to original problem of why power is not coming from relay to fuel pump? Faulty relay or wiring issue? Just because it clicks does not mean power is coming out to fuel pump. Check power into and out of relay.
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
Almost a year later, back on this.
EagleMark please send me your contact info. I need to purchase some stuff from you :)
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