Gunner Asch wrote:

On Tue, 10 Mar 2009 05:34:04 -0700 (PDT), Glenn Lyford
wrote:

My compressor pumps my 80 gallon tank, plus the compressed air hoses
(150 ft plus dryer), from 0 PSI to 125 PSI, in exactly four minutes.

How do you pull that initial vacuum?

And why?

I suspect he means PSIG. Some gages bother to mention it, some
don't...
--Glenn Lyford

But doesnt he start off with 14.6 +/- PSIG before he turns it on?

No, he starts at 0 PSIG, which is around 14.6 PSIA. His 125 PSIG also
equates to about 139.6 PSIA.