Tom, I glued the wires on my '88 Schwinn KOM earlier this year. I used the same technique; glue and zip tie, remove zip ties later.
I used Shoe Goo, which is nice because any excess globs (or after removal) can be rolled up off the frame easily with my fingers.

My wires are glued up the fork leg to the light (on the side of the front rack), zipped to the rack, then glued under the fork to the down tube (about 2" of slack here), under the BB (a little slack here, for cables), along the NDS chainstay, and up the rack strut to the tail light.
I like [MENTION=46029]fender1[/MENTION]'s suggestion of coiling the slack between the fork and downtube; I'll do that next time.

Mine had a little slack at the tail light end, so I wrapped the (black) wire around the (black) rack about 4 times before going into the tail light.


I have about ~300 miles on this setup, including plenty of gravel and dirt, and the wires have stayed in place and intact.

Since this has worked so well, I'll probably do glue the wires to my Rivendell next time I do an overhaul. At the same time, I'll install the Honjo fenders (and run the taillight wire in the fender edge) that have been sitting on my shelf for over a year.
(I got a killer deal on them, and the Velo Orange fenders currently on the bike work fine for now).