Alright... I think I will pick up a copy of the book and a good set of gauges. Now, if I need to charge the system, I will most likely end up converting it to R-134a anyways, so I'm wondering if I should get a gauge set for R-134a fittings to start with. Would this make the most sense? Or get something like the MasterCool R12/R134a dual gauge setup?

Thanks again.

J.B.