Hi Ed
Thanks for the suggestion - I do have history of it working - Speedo and odometer were working for last 4 years and just quit a week ago - I did hear a clicking sound starting late last year right before I put the truck away for winter. The clicking sound sped up with the vehicle and slowed down when the truck slowed down. I thought it might be the speedometer itself, but my tests last night showed the needle assembly still works when I spin the speedo cable manually

Also, I have not been able to find any source for the adapter unit that looks anywhere the same as what I saw - I also have the service manual for my truck and it only discusses the use of adapters for non standard size tires and rims - The speedo was about 8-10 mph off since I have owned the truck and I just attributed it to the speedometer itself being old and a bit stiff

Joe Finkelstine
Born and bred in Motown