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If you search in the 930 forum, I built my own.
Two gauges - preferably identical, that can read up to 100 psi.
Makes it real simple. Then I had to make an adaptor thing for spark plug hole, to get the air down - chopped up, ground out a spark plug for the base, then welded a special length of pipe to it, and tapped in a gas fitting for air hose in top.
Worked just fine.
Alan
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