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Carry the old (good) one as a spare because if your AOS fails in the boonies on a trip ,you could wait days for a spare part
Also be creful with the hose connections - they get brittle and difficult to seal correctly.That will give you vacuum faults.
A digital manometer could have confirmed if the AOS was marginal/good.Save a lot of work !
Search "PYLE Meters PDMM01 Digital Manometer"
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