General air pressure gauge
Discussion in 'Peterbilt Forum' started by rww, Jul 23, 2019.
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Is it for brake pressure? Push on the brake and see if it moves.
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If it never moved, it might not be hooked up.
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It’s plumbed out to the firewall for you, it is a spare air gauge. Just like a wired “spare” switch - just ready for you
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