Shift light wiring question January 31, 2015, 05:24:27 PM I'm going to be installing an Auto Meter shift light/digital tachometer:http://www.autometer.com/black-dpss-tube-level-1.html on my Thunderbird. The shift light has a three wire hookup: red to 12v switched ignition, green to coil negative, black to ground. I'm running the green wire to the coil negative wire and the black wire to a chassis ground. Could I just run the red wire to the positive side of the ignition coil? After all it is a 12v switched ignition source. I figure since I'm running the wire to the coil and already there that I might as well tap into the 12v positive side of the coil. That should work fine correct? I helped a buddy install a MSD shift light on his 89 Mustang several years ago and we followed the wiring http://static.summitracing.com/global/images/instructions/msd-8952_frm28827.pdf that had us connect the green wire to the coil negative side, the red wire to the coil positive side, and black to chassis ground. It worked fine. Quote Selected
Shift light wiring question Reply #1 – February 01, 2015, 09:51:59 PM I think I'm just going to get the power from the coil positive side wire and see if it works. I don't see why it won't. Quote Selected
Shift light wiring question Reply #2 – February 03, 2015, 06:23:50 AM I don't see any problem with wiring it the way you want. It will work fine and I expect these two wires are glued together directly from factory. Quote Selected
Shift light wiring question Reply #3 – February 03, 2015, 02:25:14 PM I'll give it a whirl after all the snow melts. I think it should work fine. Quote Selected
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