Hmm, that's a different one than I have. I noticed that the one you have goes from 0 to 30 PSI and the one I have just is a 10PSI model. I wonder if that is a difference that matters.
The one I have.
http://www.bayouclassicstore.com/Replacement_parts/7000.html
The one I have.
http://www.bayouclassicstore.com/Replacement_parts/7000.html