Mike,
Defintely watch the video if you get a chance. He doesn't address the TBW as far as running it through the bars. Some good tips in there which will make the install go smooth. I just finished up installing a set of 10" Yaffe's this morning. On those bars the right side was a PITA to run the wires through. I ran the TBW through first and followed with the switch wires.
I did purchase a set of Namz 4" extensions which I needed. I choose NOT to un install the stock plugs for the switches from the shelf under the radio.
If you need an extra set of hands gimmie a call.
Thanks Erich.......Not going to rip the bike apart so close to the Maggie Valley trip just in case I run into an issue......will be doing it over the winter, but I will remember your offer to help