Just search the forum for AID retrofit, there are threads, it has been done. I've done it on my 2015 TDI. If you want the mileage to be correct you need a new unit. After 60ish miles see odometer can no longer be changed. I know from experience, I bought new but my dealer did not set the mileage and I didn't catch it until the first time I went to the gas station (as with the regular cluster, the cruise control graphic covers the odometer).
You'll find the part number in the retrofit threads. when I bought from vwpartsvortex (I believe they are service center in New Jersey) about 8 months ago it was a little under $900 shipped. Might be cheaper now but search the part number and buy from wherever is cheapest, dealers will randomly have a different percentage off. Threads will also tell you the MOST (fiber optic) cable you need to connect if you want navigation up there. What you require will differ based on whether you have Fender/Dynaudio.
The info on this forum is all available but spread out between a few threads. There's a thread on tdiclub in the mk7 section that put the basic information together in the first post... Nothing different between the gassers and diesels as far as digital dash is concerned.
Link to that thread, note that you already have MIB 2 in your 2019, also quick googling I found a new unit for $850 shipped...
http://forums.tdiclub.com/showthread.php?t=497913
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