Deborah,
Welcome to the forums and congrats on your '66 Safari. I've owned mine for only about a month and have it pretty much gutted. I found two manuals in my trailer but of course one is for a '65 Caravel and the other is for a '67 Safari. I'm guessing the latter would be the most help to you. I could try copying the pertinent pages at work tomorrow and send you the copies if you think that would help. If this is your first foray into LP systems and whatnot, I would advise you to find the nearest ruputable RV dealer and have them inspect your Safari's systems. If the sytems are in working order, the techicians could show you correct operating procedures. There's also the chance of an Airstreamer in your vicinity with the necessary skills.
Post some pictures!