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Quote:
Originally Posted by jyl View Post
I think common gauges are relative. Since they don't read 14.7 psi when not connected to a ball.
Correct.

They are zero'd at 14.7

An absolute gauge typically requires the user to actively zero it.
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Old 01-26-2015, 02:46 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #146 (permalink)