Yeah, that one works but they still get to drive it away. If the guy is a total a-hole he'll use a solid object to stop your truck rather than pulling over politely (more than likely your money and hard work is going for a one way joy ride anyway). I would be worried about the legality of having a fuel feed under the seat and also a potential safety risk if it leaked for some unfortunate reason (Mitsubishis don't have a reputation for spontaneously combusting - we'll leave that up to other manufacturers ) I ran this ignition kill switch and a disable switch to the electric fuel pump I was using, plus a steering wheel lock. The wheel lock slows them down, the kill switch works until they get lucky and find it but if they manage to get out of the driveway without taking a beating, they weren't going too far.