In 1970 I bought a low mileage 1968 used car. Daily driver, red sports car. Under the dash I found an odd plastic affair with a slow blow fuse in it. Pushed in the car ran. Pulled out to the first stop the car started, ran about 10 seconds and blew the fuse. Pull all the way out you could change the fuse. I figured the original owner had put it in as an anti theft device. Took me a while to find the replacement fuse.
In college I parked in a large lot with minimal security. I fitted a fuel shut off controlled by a cable, and pulled a matching cable out of junkyard to operate it. The car would start, leave the lot, and be a block away when it stuttered and died on an alway busy 4 lane road. I figured it might get towed, but at least I’d get it back.
This was before thieves used trailers and tow trucks.