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Stop any thief from stealing your car? A manual transmission.
I built something years ago that did a similar job. Mine was based on a button the thief doesn’t want to push, the horn! To operate mine you had to turn the key over to start and hold it there and then press the horn to crank the engine. Had to let go of the horn button first because if you let go of the starter button then the horn would start blowing. It all used a couple of standard automotive relays, so it was cheap and blended in to the stock wiring.
