I have an ongoing argument with my boss about reading the gauges. I say the green scale for R22 tells me the saturation temp. of the refrigerant. He says it is the actual temperature of the freon in the suction line. I say no it is the temperature at which the freon saturates at the corresponding pressure. Pressure temperature relationship. Ok.. he tells me he as two years of AC college and I can't convince him different. He still maintains it is the temperature of the freon. AM I not understanding this or what??