I did quite a bit of research on this and installed a VSS in the GM Factory adapter between the trans and the transfercase. I know you have a different trans but hopefully this gets you pointed in the right direction.
I followed what this guy did. Scroll down to post #542 http://www.pirate4x4.com/forum/showt...735270&page=22
The trick is to find the reluctor ring that fits your transmissions output shaft. If Advance Adapters does not have it try Jags That Run. If neither has the exact ID you could put a Speedisleeve on the output shaft to make up any differences.
Other options are a Jags that run kit that installs at a Ujoint yoke. Their website shows it on the rear axel but I've seen guys install them at the output of the transfercase.
Since you don't need the VSS to help the transmission decide shift points, the JTR option would be an easier install and would not go to zero when the clutch is pushed in.
Hope this helps.