i purchased a combination spedometer-tach pt# 74461-03 harley part for my 2001 fatboy and hooked it up. all worked except for the tach, i heard through the grapevine there is a pink wire to hook up. i found the wire in the loom and it looks like it has a connecter on the end.does any oneknow the harley part number of the wire that goes into the wiring block? any help would be appreciated