It's hard to see in the photo, but the watch is showing the same value as the Dexcom.
Now to get the current glucose reading from the Dex. There's a software package, Dexcom Studio that comes with the Dex for downloading data from the gadget. Interestingly, it's all written in C#. Poking around in a $500 medical device's undocumented code, though, is something I'm not going to post...
Need another, "easier" way to get these numbers... Playing around with the Dexcom studio software shows that it will download all of the watches data to an XML file, bingo! A little C# code, and liberal use of the "sendkeys" command, and I can open and close the studio, and dump an XML file every few minutes.
Now, I can easily parse the file and get the Glucose value. Using the process from my last posting, I can get the number onto my watch. Success!