I have been searching and cant find a definite answer. Can I run the Edge on zero/stock for the gauges and run the Predator for my tuning with out harming anything? My milage has fallen dramaticly now that I am using the updated Edge.

Even though it is not suggested! YES you can.
But everything needs to be set on stock with the Edge.
Note: It won`t be truly stock because you have the Edge installed, but close enough it should not cause issues.
Hope this makes since.