Some new information here:

someone has changed the orig sw. to the newer replacement switch , [ red] which is 16/12 bar , cut-in, cut -out, so it is still short refrig b/c the high side gauge port reads 1-2 bar higher than the actual pressure at the drier switch port.
You should be just slightly short...plus you should not see any bubbles.

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Gone to the dark side

- Jeff