Super excited to share this with the group. With some research and a little help at Synthetos I was able to get my 4th axis working on my TinyG V8. I bought a $20 big easy driver from Sparkfun. It meets all the specs listed on Synthetos for the TinyG. I have it set up for testing now and it is synced with my X axis. I plan to make an instructable or YouTube video with details on how to do it. Now I can set up the A axis I’ve been dreaming of!!!
You are a baller sir!!
Haha thanks @Brandon_Satterfield still have a ways to go before I’m fully operational. However I think I just got past my biggest hurdle. I believe TinyG 2 already addressed this issue but it is still not ready for production. This could be a cheap 4th axis option for the SMW OX or R7.
That would be amazing. The team the other day completed a big hurdle on the plasma CNC upgrade to the R7. Spindle speed control is all but whipped, the ability to add a 4th axis would be amazing to add to this set.
Will hit you up when the guys are done crunching the fine details.
Plasma upgrade!!! Wow your making me want to drop the cash on an R7! Yes hit me up when your ready and I’ll go over the 4th axis mod with you. Until then I’ll be doing plenty of testing. 
Sweet dude, thanks.