Engine kill switch

I am looking to increase security of my 1999 trd taco. It has the factory alarm, and I would like to add an engine/ignition kill switch. Can anyone recommend one that is an easy do-it-yourself install?

 

A wire with toggle switch to the coil. What i used for a vw bug.

 

You could wire a switch into the relay harness at the ignition switch, part you put the key in, or just pull the fuel pump fuse which is what I do if I leave my truck in a parking garage or on the street. I also pull it every night before going to sleep.