Sorry for letting this get 4 pages back!
I've been out of town.
Govert - you are a wealth of information and I
do appreciate your efforts.
That being said, I picked up a switchover valve at the pnp ($6) that appears to be in great shape. It functions properly and the little teflon thingy is in good shape.
I'll connect it up per the diagrams you sent and report back with the vacuum readings.
It may not be until Friday but I'll report as soon as I can.
Thanks again govert!