Just want to throw this out there while this thread is still at the top...
The other way to add TUTD to the 6L80E, especially if you just want switches like greasychevy did, would be to use a '09 and up Corvette flash in the TCM, and run the wire directly to the transmission as the Corvette doesn't go through the BCM for TUTD, its straight to the TCM. It is supposed to be a little quicker, with less delay.
Here is a good thread on efilive on this: https://forum.efilive.com/showthread.ph ... tchs/page3
I haven't fully fleshed it out yet, but I bet if someone was interested in this, one call to Speartech would get you the answers.
I saw conflicting info on if the G8 shifter would work out of the box with a Corvette tune in the TCM. Apparently a Malibu shifter will from what I read.