I had an MR-2 for seventeen years, and I hacked my own engine disable system. If you started the car without the (non-heating) cigarette lighter pushed in, then the car would run fine for 30 seconds, and then the fuel gauge would go to zero and ten seconds later the car would die.

I loved the idea, until the system became flakey and I found myself time and again frantically pumping the cigarette lighter, hoping to get it to behave. I finally removed it. (Ah, youth...)