For those that don't know, Jason generously donated his original cluster to me to play with.

I hooked it up tonight to start playing with it. I'll post a dedicated thread once I make some real progress. Right now the backlights come on and I can get it to briefly respond on the CAN bus, but it doesn't do much of anything useful.
I have two questions though.
One, what tools did you need to swap it out? I might go to the junkyard and try to get an electrical connector for it, and I want to make sure I bring the right tools. GM has these little 7mm screws that hold most of their dashboards together.
Did your truck have around 37,122 miles on it when you swapped out the cluster? Even though I can't get the odometer to light up yet, there's a CAN message that seems to be reporting 59743 km. 37122 miles.