fuel cut off switch

Has anyone installed a fuel cut off switch for their wagons or any civic? I don't have automatic locks and don't feel like making my wagovan have automatic locks. So does anyone know how or know someone who's done it?
Comments
There are actually several ways to do it, but I think the easiest is to put a switch on the ground wire for the fuel pump. When the switch is on, the fuel pump works...when the switch is turned off, the electric pump is no longer grounded and will not work.