Forget about kill switches or alarms. In the city, nobody pays the slightest attention to a car alarm, and a kill switch will be bypassed in a heartbeat.
If you want to shut down a thief, re plumb your fuel feed line and plumb in a gate valve to where only you know where it is and just flip that lever when you park it and a thief will get er fired and make it about a hundred feet and stall right about the time they hit the street and panic and leave the thing I've managed to forget that I've had teh fuel shutoff on me bed tank a few times and been left sitting there cussing until I realized what the problem was
If you want to shut down a thief, re plumb your fuel feed line and plumb in a gate valve to where only you know where it is and just flip that lever when you park it and a thief will get er fired and make it about a hundred feet and stall right about the time they hit the street and panic and leave the thing I've managed to forget that I've had teh fuel shutoff on me bed tank a few times and been left sitting there cussing until I realized what the problem was