Easiest circuit to bridge for an under dash kill switch?

[box986]

Anybody install a kill switch tied to the fuel pump, EFI circuit or something else? Can it be done under the dash or do I have to tie to a circuit under the hood? Thanks

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[KABQ]

https://www.bronco6g.com/forum/thre...en-in-my-neighborhood-in-the-last-week.86536/

https://www.bronco6g.com/forum/threads/kill-switch-and-fuel-pump-wiring.94194/

https://www.bronco6g.com/forum/threads/am-i-crazy-kill-switch-for-security-anti-theft.47923/

https://www.bronco6g.com/forum/threads/kill-switch.27142/