The Vacuum Gauge was starting to climb so I replaced the Air Filter today. 1982 6V92 Air Filter--Baldwin #PA 2722.
Posting this for others.
Got theAir Filter at NAPA with a discounted price~~~@ about $75.00.
was asked to post pics of the Vacuum Gauge in the rear panel and where it attaches to the intake...& yes I saw the spider webs and will clean that area later
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Steve thanks for posting those pics. I don't recall seeing this on my coach. I can see how it would be great for monitoring the air filter.