Some wiring, soldering, and heat shrink tubing allowed for the completion of the work. Way more time than it should have consumed, but iris now complete. A nighttime ride proved the visibility to the rear went a long way. Daytime should be much better as well, and that was the goal.
!["image.jpg"]("https://www.classicvelocity.com/wp-content/uploads/2015/04/image-2.jpg")