I have a Taig with exactly the same setup - hardware and software - even configured in metric already. I would be happy to forward the .xml file or post it here if someone could tell me how (only been here this week)
I have the A axis steps/mm setup a bit wierd right now, but it is easy enough to fix for you depending if you want the DRO to read actual degrees or not.
A lot of this depends on your software. If it only uses an emulated A axis you may have to set it up to a very strange number to counteract the adjustments put in by the post-processor. What software are you using to generate code?