Scenario; new motor, I left off the OEM oil pressure switch cause I have a gauge. Is that switch a hard wire circuit to the ignition? I have exterior and interior lights but no signs of life at the dash or ignition/starter. 1985 with SBC350. At the same time, I found I had pinched the BATT (pink) lead between the motor and trans, causing a direct short; fixed that, no blown fuses or fusible links. At the same time, it has an old Viper from PO that resets when batt is disconnected, but now the remote control just flashes when prompted which I think means it reads the truck has no batt. Looking at the wiring diagram, it looks like the oil press switch circuit leads to IGN3. Its looking more and more to me like press switch needs to be screwed in (ground) and connected (closing the circuit). I'll try the press switch solution tomorrow afternoon, sure would be fun if anybody else bin there, dun dat.