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> I'm sure this question has been answered before but what if the 1st
> stage w/ the gauge needs to be isolated from the system? Then since
> the air gauge is basically inoperable how is air mang. dealt with?

The only reason to "isolate" is due to a failure of some kind. If a
failure occurs, then you exit.

Assuming that you have properly managed your gas during the
penetration, then you do not need to do "air management" during an
exit, since you know you have at least twice the gas that you will
need to get out (or, in the case of isolating, then you should have
*exactly* as much gas as you need to get out).

At that point, the only thing you need to worry about in regards to
the amount of gas in your tanks is whether or not there is any. If
there is, then you breath it. If there isn't, then you share air with
your buddy. The exact amount of gas is irrelevant, and so (at least
in that situation) the pressure gauge is unnecessary.

-JimG
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