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WebJun 17, 2024 · Step-by-Step Instructions 1. Reading vacuum pressure already in a system. This is one of the basic tasks of the HVAC manifold gauge. To get the pressure readings, attach the red hose to the HVAC system’s high-pressure line. The hose will connect the high-pressure gauge to the corresponding high-pressure line of the cooling unit. WebReadWorks is an edtech nonprofit organization that is committed to helping to solve America’s reading comprehension crisis. dictionary\\u0027s 6c