bob,
hopefully you've gotten an answer by now on where the wires go. If you haven't, I can tell you that I had to take mine into the HD shop and have them do it because the wiring got a little tricky. They didn't even know how to do it. Took them 2 hours to figure it out. They had to splice into the wiring harness under the speedo mount and install the correct plug to make a quick disconnect if I ever need to move things around. They did a great job and it was worth the $75 to get it done right rather than a long, drawn out, possibly disasterous wiring job I would have done on my own. They said that it was a tricky job for even the HD mechanics. I suppose you could do it yourself if you had an intimate knowledge of HD wiring but do you really want the wiring looking all chopped up under there if you screw it up? I wouldn't. Let us know how it works out.
PG