When I was parking my '87 in a sketchy neighborhood a couple of years ago, I installed a push-button breaker switch on the electrical supply that goes back to the fuel pump. And I put the button facing up and right beneath the shift boot so it's easy to operate if you know where to push but hidden to everyone else. Press the button and the supply is interrupted. Come back in the morning and try to remember that you opened the switch in the preceding night.
So in the event that an unauthorized driver uses a screwdriver to force-start the car, if the breaker is open the engine is just going to turn over and over but it won't fire up.
The benefit to this arrangement was the simplicity in the wiring setup; I just cut the fuel pump supply that's traveling right beneath the switch and soldered in some small tails to connect to the terminals. Very straightforward.
I suppose with a little more study, I could have done some routing through the fog light switch. I've gotta study the wiring diagrams to see if I can do that in my '92.
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