What's the cleanest way to wire a cut off switch

Moparkid, I probably been drag racing NHRA since

Just because you've been doing something for XX years does not mean you have been doing it RIGHT. I have posted the NHRA relevant section. If you have "passed" inspection with this, it's only because the tech guys did not LOOK.

Please stop with your meaningless arguments on this matter. The OP clearly said that he wants to show up at a racetrack. If he does, he needs to do this correctly so that if and when a tech guy actually LOOKS at the car and TESTS the switch, the damn thing actually meets the rulebook.

Your statement that your switch kills the engine is NOT correct, if you run an alternator. This is not opinion. This is a fact of physics

For your edification, the first time I showed up at a racetrack was 1963.