Another thing to remeber is that the sa63 dash will be with a tacho for a 4cyl, whereas the AM61 is for a 6cyl.
I'm facing a slightly different challenge in that I am putting a MA61 Analog dash from a Singaporean MA61.
From comparing the two wiring diagrams in the Mk2 TSRM, it will be fun as the plugs and cct logic don't quite match up (I'm mechanical based not electrical) but it will be some fun for the future
Keep me informed, and I may even be able to help/swap notes