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Put the switch in the positive feed wire that is common to all 4 injectors. Look in the wiring diagram, and you will find it. Some have used relays, I did not because the injectors in my car are 14.4 ohms each, and with only one firing at a time, you are looking at only 1 amp through the switch. Heck, interior dome lights are more that that. Like I said, I have not had any problems with mine and have been using it for over a year and I EOC a lot. I did put spade disconnects in the wires under the dash, so if I do have a problem, it would take me about 30 seconds to bypass the switch.
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