This can be a little tough...with EFI there are lots of integrated systems, it's not as simple as hooking a up a single hot wire to the ignition on an old-style points-ignition engine. I'll have to dig out my wiring diagrams and see what I can come up with.
What are you trying to accomplish? Is this for an engine swap, or just doing away with a bad ignition switch on a farm truck or...???
Ah, that makes a difference. There are a few systems we can do away with then...but you're allowed to run EFI? Is it circle track, drag, or what...? (I used to run a mini-stock in circle track racing, but we were only allowed to run carbs, no EFI...)
For EFI you will need to retain the computer wiring harness, engine sensors, EEC and fuel pump relays. To use a toggle switch, wire it to the EEC relay from a fuse to the battery positive, and the fuel pump contact side of the relay. The EEC relay powers the fuel pump relay coil and the engine sensors and computer. jd