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To disconnect the gauge set from service valves: E Quickly disconnect the charging hoses from the service valves. E Always disconnect the low side while the engine is running. I Disconnect the high side with the engine OFF and after the pressure has stabilized. Manifold gauge interpretation takes some practice and must be completed with consideration of the other symptoms and potential problems that have been identified in the system. Precautions E Wear protective clothing and eyewear, do not al