Sounds to me you're the perfect volunteer If it fails sell it. $100 is cheap for a cluster. They must be reliable. it get's tricky with all the variants. I got lucky when my Diesel SLX Cluster went wacko, I think $100 delivered but usually $150 or more
i have been thinking about this for the last week, but i have a few concerns that are stopping me.
firstly, are all GD series the same? and what i mean by that is the menus and submenus built into the dash itself, from 2012 to 2016 to change things like locking the doors whilst driving off etc. For the project to work the menus and submenus would need to be exactly that same.
what about active eco, i found a youtube video from 2013 with a demonstration of the menus and submenus of the supervision cluster. it appears to be a little different to my 2016 car. (maybe its the difference between auto and manual, but then again, there could be significant changes), the active eco seems to be built into the menu on this particular car!
more research is needed.......