Need Plumbing Schematic for '61 Tradewind

[64Overlander]

I am currently evaluating my plumbing system on my 61 Tradewind. It still has the original water tank with a pump under the kitchen cabinet that appears to operate by compressed air. I am unsure how to operate this as it probably has a couple of floats in the tank, but I am not sure about this. Water tank is in the back of the trailer under the double bed on street side. Trying to figure out drainage to black tank as well. I would appreciate any help.
Thanks,
Scott