Too low for air pressure or oil pressure. Possibly in the range for fuel pressure. I would try to look at the back-plate to find out manufacturer and model#. Then try to Google the information. Good luck.
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aj
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2004 Gulf Stream Crescendo 8356
1999 Bounder 30E (traded 2018 on GF)
1997 Hornet 25 TT (sold 2003)
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