Whats the best thief protection device available?

[srv1]

you guys have good ideas, but some are expensive. the easiest to have a small kill switch. wether it would be for the computer, ignition or fuel pump, any of these are very effective. will the thief find it? most likely not. he doesnt want to draw attention to himself by taking his sweet old time finding a switch that isnt easily accessable. you want ideas where to put a small micro switch? here they are and i guarantee they wouldnt fiid them.

1. put a kill swith under the shifter boot.
2. your vanity mirrors that have the lights in them, put the swith under or around the mirror. if he so happens to look up there he would most likely think it is for the mirror anyways.
3. under or around the ebrake lever or the button for the ebrake lever as the switch.
4. use the dome light swith
5. put an extra swith on the side of the seat. the thief most likely would not look there, if he did, he would think it is the power seat button.
6. in the armrest of the door underneath it. put it in an access screw hole.
7. if no rear defroster was equipped in your car or you are not using it, get the switch from the dealer if you dont have one, or use the defog switch you have as one if you dont or cant use the rear defog.
8. same idea as the defog switch, but use the foglamp switch if your car doesnt have them
9. use a map light switch.

those are just some of the ideas i could think of.