Hey everyone, I just did a swap of the analog DIM cluster from my 2012 S60 to a newer style TFT DIM from the 2014+ S60 models.
There's a good amount of information on this installation already, so I'll preface this thread with a link to the long running thread discussion.
There had been talk here and there that I had found in the past on getting everything but the Power/Eco gauges to work, but I could never find the correct procedure for that, just talk of some wiring with no specifics.
Thankfully, a few weeks ago, that final piece was relayed to me by Pietila (thanks my friend!). I put this post together to serve as a somewhat condensed DIY of sorts, in hopes of consolidating that information in one thread so that others can more easily find it.
December 2018 Update:
After a year, both XeMODeX and Vesper Volvo have not delivered on a retrofit solution, but VDASH has apparently figured much of it out for CEM unlocking and software upgrades. The pertinent post is quoted below. This involves using VDASH to unlock the CEM (through brute force method), enabling you to configure the TFT display for those who have difficulty with the retrofit, or who want to enable new options/colors/etc.