I have also been working on this on a T8500 and it should share the same harness. My recent post is here. I have some of the diagrams that I have on it there. I have not put it in yet but I did attach the pin out in mine. There is also a thread that I referenced in my first post that has a lot of good information with another that worked on his Case 230 that is really good as well. There was also a person about half way through his thread that posted a decent diagram. Its for an older board but should be able to tie it together.
Couple of things to watch out for. The wheel angle sensor on the T8000 series was different for me. Mine has 6 wires and has a separate power, ground, and signal wire for the auto diff lock and autosteer. On the Case Puma 230 in the other thread it shares the same signal wire and there is a plug by the radiator that he splices a Y for the signal wire to share between the two.
The other is that almost every wire is at the 40 pin except for the pin to activate the hydraulic valve. I bought the factory service manual and found out it goes to the transmission computer. On the puma thread he finds it on his Case in a different harness plug and then just pulls the pin and extends the wire. I am planning on just bypassing it and running my own two pin of positive and ground to that plug on the valve.
It will be some time until I get digging into this one as I am currently working on our planter tractor instead but I do plan to try to get this one up in the next couple of weeks. Plan on reporting later on how it all goes. Hope this helps some.