Mike, it looks to me like you have the coil and resistor wired correctly. If you want to monitor oil pressure (assuming that your gauge uses an electrical sending unit and not a mechanical gauge like the original) you might need to temporarily power just the gauge circuit. I'm assuming you just want to crank the engine till oil pressure builds. If your oil pressure gauge is piped in to the oil gallery physically, as original, what you need to do is disconnect that starter switch to coil bypass wire so the plugs won't fire and then just crank the engine. If you don't disconnect it, the engine will start and run as long as you have the starter engaged, and stop as soon as you take your foot off the starter pedal.
