Vehicle security for long road trip

Only takes a quarter to defeat that. Best guess is the thief would try to start the car, and in about 5 seconds pop the hood and hit the relay with something metal and fire the car up.

I like it, just saying if there is power, takes almost no time to getting running.

Del (@67Dart273) has had some good ideas where the MSD could be setup to cause a no start issue. That seems like a better idea than trying to defeat the starter circuit since running power direct to the MSD box wouldn't defeat the kill switch.
i'd install it just before starter, guess if we're talking slant six be easy to bypass, could hide a continuous relay on the main battery cable somewhere and have it control that.