SC cut-off switch

[JB]

Can anyone give me some guidence on wiring in a PCA Club race approved cut-off switch in a stock '82 911SC? I have a Sparco switch with 2 main terminals, 2 normally open terminals, and two normally closed terminals. They provide a 3 ohm resistor to drain off voltage to ground to prevent run-on current from the alternator. There are three smaller red wires going to the battery now as well as a larger cable running back to the starter. I must be missing something simple but am having trouble getting it to work.

Thanks!

JB