I am offering an unused and unopened Dakota Digital SIM-1A-GL Speed Calibrator device. Plenty of discussion here on the forum on how to install one on a Goldwing. If you've ever wanted to correct your speedometer, specifically on the older 5th generation models, this is the device you need.
Contact via PM. It may take up to 24 hours for a reply, patience appreciated. This has been posted to other web forums as well as this one.