i just put an alarm with engine imobilizer. the imobilizer is rigged to the ignition, fuel pump, and starter. the alarm has switches on all doors, and impact sensor, and a dual proximity sensor. try jacking it up, and it goes off, open the doors it goes off. stick your hands inside it goes off, and if you get too close is churps.
oh and if i hear it going off while i'm sleeping, there is an armed response "colt 1911"