Now on to the engine compartment for some wiring modifications. I based this on a schematic I found on jalopyjournal.com.
I installed an oil pressure safety switch using a brass tee fitting to the port on the upper rear of the engine block. The line for my pressure gauge is connected to the top of the tee now. I've attached a schematic that shows the modifications I made to the harness.
***EDIT***
I modified the wiring to include a time-delay relay that runs the pump for 5 seconds prior to cranking the engine.