trackvw

I would like to put a toggle switch to cut off the fuel pump power as a security switch , so with the switch in the "off" position the motor will turn but not start , My van was stolen a few months ago from in front of my house in broad daylight , and I was home ! i did get it back within an hour because I had a tracker in it , and if it was only 1 mile away , But if they would have headed to the freeway it could have been 30 miles away ! anyway I would love to hear your ideas , is there a pigtail that can go in the fuse slot that I can connect the cut off switch ? and where is the fuse ? Thanks for your ideas..............