Well, it took a very long time for the items to arrive (almost 4 weeks from the order date), but I finally rec'd my order from Eastern Beaver on Friday. A "Three Circuit Solution", which adds 3 switched / fused circuits (I chose to order one circuit unswitched, i.e., always hot even with the key out of the bike), and a dual horn relay for my fiamm highway blaster horns which plugged right into my new fuse harness. The install took a full three hours to lay it all out and decide on the best way to route everything, and of course the seat and tank and panels had to come off. I wish now that I had taken pics of the install, but if anyone has any questions I'll be happy to take pics. It was a tight fit but it looks good and secure. Still need to make a new bracket to get the horns right where I want them, but that's a project for later, probably when I install a powerlet.
Horns are loud, and had one chance to use them today on a 110 mile road trip out to Lancaster and back. Definitely startled an inattentive driver right back into the moment.
The other thing that tickled me today... I had the bike up to an indicated 80 mph on the turnpike. The tuneup a couple weeks ago made a huge difference in how this bike runs. It honestly felt better at speed, in terms of stability, than a 2007 BMW GS650 XCountry I test drove over the weekend. THAT bike geometry is wiggly waggly and a tank slapper waiting to happen.
Thanks to the folks who have kindly answered my questions over the past several weeks - slowly getting my TW just the way I want her. Next up... power outlet for my phone charger, and probably the rear cyclerack. Can't seem to talk myself out of it...