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

The battery hasn't been up front since it was owned by the old woman before I acquired it and was stock. I haven't a clue to NHRA rules today and to tell you the truth, they never said anything to me when I raced this Signet back in the 90's. As of today it is still in the Signet and NHRA means nothing to my daily driver

Well since the OP mentioned this, HE has to pass NHRA. If the tech guys didn't catch yours, it's because they didn't LOOK or ask

i'm told needs a cutoff switch to pass tech at the tracks..