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 Mark, at this point the dive is over ( reg failure), and you will be able to 
tell when you are out of gas. In practice, you are diving with buddies of equal 
breathing rate and identical tank capacity. I had a guage fail 6500 feet back
in 
Wakulla, and when I wanted to konw where I was on gas, I just looked over at 
Brent's. you could turn it back on, but only to satisfy your curiosity. 

 Depth and time are the same as a pressure guage for most people. I almost
never 
check my gas, since I can more easily see my bottom timer/ depth guage, and my 
hoses are rigged in such a fashion ( see "Doing IT Right" ) that if there were 
any movement of gas in the system, I here it as they all touch my neck, and the 
HP hose shreiks when leaking, and is a pinhole anyway.

  I also plan my gas in advance for the depth and time, and only need to check 
for a cutoff point when we are delayed or are doing something repetitive in one 
area, but then the rebreather is what we would use for that anyway, and then
gas 
management is a non-issue, since I have full 121's on as well, and can go
12,000 
feet at 300 on that much open circuit.

   We also run into the turn issue if we have to pass through restrictions. 

   I am amazed that instructors don't teach this kind of logic - probably 
because 99% of them do no real diving, and have no real clue.



on Sat, 15 Feb 1997, Mark Melendez <SUBMRGE@wo*.at*.ne*> wrote:
>I'm in the process of putting together my first doubles rig and have a
>question about the use of only 1 pressure gauge.
>
>As shown in "Doing it Right", the rig only has 1 gauge. 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?
>
>I seem to remember George mentioning something about just turning the
>bad reg on for a moment, long enough to read the gauge. Is this correct?
>
>Thanks,
>
>Mark
>
>
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