Several have posted about the inertia kill switch they've installed in their cars but have not disclosed the source of such switch. I'm ready to install one but haven't been able to find one. Where do you get them?
Mid 80's to mid 90's ford are the easiest to score used. Problem they used to have was if you went over a speed bump too fast they would trip. I had a lot from people stuck in the parking lot by my old work at night, I walk over, flip the switch, tell them to take it easy over speed bumps/driveways and sometimes they would come back with food . Ahhhhh good times.................
I though of a car jacking/kill switch, I found a switch for a jet ski. You hook it to your jacket and when you get out it pulls the "key" out and kills the car.
If you get a used one, test is several times before installing.
Test with a sharp rap with a screwdriver or similar.
Use a test light or ohmeter to tell if it switches off.