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Reply to PT'S 70 CST
Yours is the first one I have seen coming out of a big truck. There is hope! The air pressure gauge is mainly for the air brake system in the truck. Air pressure actuates the trailer brakes. If the truck has spring-powered emergency/parking brakes on it or is hauling a trailer w/spring emergency/parking brakes on it then the driver would want to know if he is loosing air pressure. When the air pressure gets below around 60psi the brakes set. Not a good thing if you are trucking down the road. That is what I would be using the gauge for.
Ernie
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72 2WD Blazer
68 SWB Fleetside
67 SWB Stepside
2005 Chevy 1500HD Crewcab
56 Chris Craft Mahogany Runabout
Looking for 36 Chevy 1/2 Ton P/U Project
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