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Ok, I am a bit confused. You are asking where the low side service port is, yet you also state you have hooked gages up to it to read the pressures. The gages go to the high and low side service ports.
Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
The low pressure connection is next to the accumulator/drier.
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Hello again Chris here,