Yay! speedometer and odometer functions worked! I just logged my “first 12 miles” with a 30-minute neighborhood course at dusk. Very relieved and pleased!
NOTE: still need to do some minor work to get the blinker LED light to work when left-hand turning (right-hand turn works) and the “neutral light” wasn’t working (poop!) so will try to solve both next time I crack into the headlight birdnest of cables and post here how I fixed it (have some good leads over at hondatwins.net for the blinker minor issue…)