American Iron mustang build

im just talking about in general, im not talking about him rolling it or shit, i was just asking a question thats all, then i read the rule book and it states the following

15.8 Master Switch
An electrical master switch is recommended on all cars, and required on some, as listed
in the class rules. It shall be mounted so that it is easily accessible from the outside. If
mounted outside the cockpit, it should be mounted in an area where it is least likely to be
damage (i.e. cowling near wipers). The switch shall cut all power except to the on-board
fire system and any other life support / medical device. The switch location must be
clearly marked. Any marked switch must function as per this rule, or the indication decal
must be removed.