Originally Posted by
DMC5180
Refer to this Static vapor pressure chart: [edit] my link popped up broken. So just google 134a vapor pressure chart. Select images.
Static pressure is not an indicator of how full the system is. It only tells you that refrigerant is present. When static, the pressures observed on a Low side and high side manifold gauge set will be equal.
Without a manifold set, you are playing a bit of a guessing game. Yes you can fill with just low side adapter hose with an inline gauge. But you are guessing at how much is in the system unless you know you are at zero to start with. If at zero you will need about 2.5 12 oz cans or 1.85-.9 lbs.
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