You do not need the computer with the AW shifting setup. In his setup he has a lockout for the torque converter. If you have any questions search under his name on Pirate (BrettM) where he has a thread with every question about his setup answered as well as testimonials from people using it. I have been looking into this for my 93 yj and as far as his setup goes its like a 20min install and your ready to go.
Granted you still need to make crossmembers/make sure your tcase has the right splined input shaft/etc.
Leach