On Wed, 20 Mar 2013 06:32:46 -0700 (PDT), Ken Grunke
wrote:

Wild_Bill wrote:
In the section where the button is, there should probably be a check valve
which holds the pressure in the gage until the user presses the button.

Nope, it's just the release valve. That works fine. I can blow into the hose with all my cheekmuscles, and the button will release the pressure - there is nothing between the gauge and the plug adapter, only a free passage. Same with the old gauge, it has only the release valve. That one is a Schrader valve in a T-fitting just below the gauge which is plainly seen in my first pictu
http://www.token.crwoodturner.com/im...iongauge01.jpg

I am assuming there has to be a separate check valve INLINE between the plug adapter and the gauge below the release valve. That is what I am missing. It may be a fitting I had, but absent-mindedly misplaced.
Is there an internal thread anywhere in the end of the hose/fitting?
If so, pop a tire valve in and try it A tire valve may drop your
pressure reading a bit more than the "proper" valve - some testers
uses special valves, some used regular tire valves - some long - some
short. Long will have less effect on the reading if it can be used
(softer spring)