Great information, thank you all again. I have a DrewTech Cardaq Plus2 so I can reflash modules if need be, I will need to figure out which module the the Sync resides in... my guess is it will be in the APIM. If I reflash to the As-Built, I should get back to 2.6, I think. I can and will go to the Ford website and download the As-Built data for my car but it is binary so you can't really find the version information inside of the files easily, iirc.
If I am successful at that then I might feel daring enough to try the 3.4 upgrade. It used to be all too easy to brick modules, that has gotten better, thankfully. I'll check the cost of the module in question first and decide if it is worth the risk, mostly it would just be for education, as someone said earlier, I doubt that I will see any gain. Truly, I would be happy to get back to the previous version at this point and see if the tach goes back to the way I remember it working.
Here is the module reset procedure from the Sync rep...
I thought it odd that you lock the driver's door while it was open and then shut it, but I followed the procedure as stated. If anyone recognizes this and knows exactly which module this reset it for I'd appreciate the information.
-Gary