I had this idea a while ago.
Get an RFID reader and install the sensor for it in the drivers seat.
Stash the rest of the electronics somewhere where it won't be easily noticed, use it to cut power to the fuel pump, or coil. Do everything you can to make it look like the extra wires belong there.
Then you just carry a RFID card in your wallet. Jeep won't start if you aren't in it. Jeep dies within seconds if you hop out.
You could even have some fun with your friends, or make a few $ off strangers, by betting them they couldn't start your Jeep.
Of course I am a lazy bastard, so I just put on the club and walk away.
Check out my cheep bastard Jeep mod blog.
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