I think he's talking about a full electrical system shut off switch. You should just be able to get a high votage turn style switch which is probably what you have and run your pos. batt cable to it, then out, which will disco the batt and you'll have no electrical at all when it's off. The hardest part should be finding a place to put it, if you want it inside as a security thing or outside for the safety team to be able to get to at the track.
I'm going to put one on my vert and mount it right inside the rear driverside window so when I'm at the track I can just roll that window down before the race for crash team access plus it will be close to the battery so I don't need so much cable.
For security I don't think you need anything this complicated. I have two simple toggle switchs, one in the trunk wired to the fuel pump power, the other is in a different location which is my secret, but it's also wired to the pump, both need to be switched on or it will just crank and run for about 5 seconds until the fuel runs out of the lines.