There are a couple of ways to plumb.
John, on our -6A, we went from the filter to either the DG or AH...can't recall, then on to the vacuum pump, minimizing hoses, connecting them in "series", if you will.
I don't quite understand why your DG had two Tees in the line but for now, you may either have to plug open ends or just use one line from the DG to the pump, until your AH comes back from the shop.
Best,