Make shift kill switch?
Kill switches are a good idea until the thieves bring a trailer
This is about it. There's a hundred ways of doing this depending on the car and it's systems
If you have a tach already wired, or even if you don't, and IF you have a 'switched" type ignition, such as breaker points, Mopar ECU, GM HEI, etc, you can just add a simple switch to ground the coil NEG
If you have MSD look it up. I believe you switch a ground to the white wire
If you have an electric pump, break the pump relay coil
All this can be done with small, minimal wiring and a simple switch. Put the switch "somewhere," IE under the corner of the seat, etc, they are not going to waste much time
Figure out a way to lock the hook (LOL EDIT the HOOD)
If you have a trunk mount battery, and can build a "pushrod" deactivated switch, use a sleeve and a rod, telescoped. A push turns it off, you have to open the trunk to re-engage.
You can also "pull" a disconnect with a bicycle shift cable--you can buy those in bulk
If you have slot mags, get some plastic covered chain, lock through the spokes and around a rear leaf
