I have it wired in to the 12v start circuit and it activates with the key on start. I was just trying to use the fuel pump wire from the fuse panel to wire in a momentary switch.
Adding a switch is best done in series with the relay coil. The idea of the relay is delivering a low impedance supply as direct as possible to the load, without extra wiring and switch on the load side. The coil side is low current, so smaller wire and additional switch will not harm the actuation of the relay. Not sure if the mystery fuel pump wire, fits into what I suggest.
