Man am I late to the party on this one....
Getting Charlie off the trailer has been one of the greatest Stovebolt accomplishments. Now that John has long-drive envy, I look forward to being his wingman on many adventures!
As for the speedometer in the truck, John will likely need to do both a speedo repair since it is not currently working, then install the adapter Grigg mentioned. This is what I did to my truck a few years ago.