i have the same question about my 94 3.0l, ford seemed to think it wasnt necessary to put one in the cluster for the manual trans, but the cluster i took out that was set up for the automatic had one in it. anyways, i was looking at the schematic for the coil and ignition system in the haynes manual and there are two wires going into my coil and then the radio noise suppressor is grounded to the coil mouting bracket. i was thinking about just running my wire to there and then putting a ring terminal end on it and calling it good until i can start it and see if it works. if not then ill try one of the two wires but at least for now i have my wires run and cut to the right length.