So the JK Rubi tcases varied across the production years.
If I recall correctly, one from a 07-11 auto will bolt up to your transmission. I doubt it would bolt up to your tcase skid. Yokes or driveshafts would have to be changed too.
Any year manual will also bolt up. 2012+ auto will NOT work.
No speedo because JKs use wheel speed sensors. I’ve heard of folks using like a GPS-based speedo.