Fuel cutoff

Anyone have instructions on how to make one of those fuel cut-offs for an 89 dx hatch? You know one of those switches you hide somewhere in the car and you can't turn the car on without turning the switch on...

what i was goign to do is just go to the wire that gives the pump power and just slice a switch into it but you can put the switch anywhere........im goign to be doing it soon once i buy a switch but if you dont kno what im talking about just PM me....