hi Blackdog_kt
I found this part you wrote very interesting:
b) The units are relative and not absolute.
"This means that while the boost gauge measures manifold pressure in psi it is not the actual pressure in the manifold. What it measures is the pressure in psi relative to the standard pressure on sea level ie, it shows you how far above or below you are from standard sea level pressure"
I now realize the above bit of info has been written about in the other posts expressed in formulas etc. but the way you put it is easier to understand....it's little bits of practical knowledge like this that will help to fully comprehend the basic principles of boost etc.
there's been much advice given on this subject and to be honest alot of it has been too hard to follow completely...if this was real life and my life depended on it I would make damned sure I did... 100% of it...but it ain't and I just what enough info in order to "fly" these simulated aircraft well enough so that the A.I. or the humans online are not always handing me my ass back
thanks