I am going to brew a 5 gallon wheat. I am thinking of adding some dried orange peels. I am thinking about 3 table spoons worth. Anyone have an opinion on this?

Really depends on how "orangy" you want the finished brew to be.
Try mixed peel instead, produces a much more rounded style.

That acutaully is part of the problem, I haven't decided how orangy I want it to be. :(. I can post the recipe if it would help.