It's a mechanical gauge, so there's only so many things that would cause the gauge to not read. Hose not attached at one or both ends > proper vac source > kinked/pinched hose > faulty gauge.
I don't do it on purpose, I swear!
but
take it as a compliment that your posts are interesting enough for me to respond to. My time is very valuable and I don't like to waste it.:P
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