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You really need a gauge on both sides, hi and low.
If it is overcharged, the high and low sides will read too high, like over 300 PSI unless it is really hot there. That chart above is a guide. best practice is start with an empty system, so pull a vacuum, and charge from there.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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