I do see a variety of lines, with some "T"s in them. One of the lines runs to a plastic ball, about the size of a grapefuit, that is bolted to my hood. It is located on the driver side of the truck and at first glance looks to be in poor shape. Running as far as I could under the hood, tracing eah line, I did come across some questionable cracking.
If that plastic ball sounds like the resovoir to you then I think I am on the right track. I'll have to head up to Checker or Autozone to see if there is a vacum gauge available for rent, unless their inexpensive.
I'll go this route and report back on my vacuum pressure....thanks for your help.