Originally Posted by The Stig
Wait, so have you actually tried to install it on a 2013 or are you saying it won't work because they are different part numbers?
The pn for the 10-12 models is different than the 13, the bcm is different as well. We have not been able to get a 13 gauge pack to try yet. The GM acc gauge pack which is available is the 10-12 model and it will NOT work in a '13.
When GM releases the '13 gage pack it will either be plug and play or plug and update the bcm software.
Currently there is no availability for the '13 models and when I checked with GM 3 months ago they did not have a release date scheduled.