Making a car difficult to steal

Electric fuel solenoid, and a toggle switch labeled fog lights, works for me.

Ha Ha, not any more! Kidding of course but great idea. Electric fuel pump switch somewhere out of site or labeled incorrectly as above.

Dont know how this works, but might be fun..directional finder or PC tattle tale? They have loads of them...
http://dx.com/p/mini-cars-pets-kids...in-plug-adapter-usb-cable-black-157795?item=3