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The high pressure AND the low pressure switches are all in same place, where the receiver drier is. The function of the high pressure switch is to switch on the aux fan to cool the condenser. The low pressure switch is to assert there is enough R12 in the system. The low presssure switch overrides all the control. This is what I would do. The dye is in there so I would leave it the way it is. You can check whether the compressor would run by jumping the switches. Remove the wire harness on the r/d and short the harness with a piece of copper wire. If you do not know which one is high or low just jump both. Start the car and push the button for A/C. If everything within the ACC works then the compressor should engage. Make sure you only runs it for a short while, less then 30 sec to do a visual.
Has the system been vacuumed down? If it has and the compressor runs then you can remove the jump wires and charge from the lower pressure port. It is possible that the R12 pressure from the can would activate the low pressure switch and starts the compressor. If not then you may have to leave the jumper wires in place until enough R12 is sucked in to activate the switch.
A/C is not as complicated as it made out to be. Make sure you wear safety goggles and protective clothing. I have done a lot of R12->R134 conversion and A/C repairs and my average DIY skill never fails me. Good luck.
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