Originally Posted by IAGTA
Both the high pressure switch, located on the hard line that runs from the condenser to the evaporator (at least on my 1988), and the low pressure switch, located on the back of the compressor, are available at the local auto parts store. I'm replacing my compressor and needed a new low pressure switch so I purchased one at my local NAPA store today. I know Rock Auto has both listed on their site.
You have these backwards.
The low pressure switch is on the accumulator.
The high pressure cut off switch is in the back of the compressor. You'll need a snap ring tool to get the old one off and the new one on. After that, they should be easy to get out.
The high pressure switch on the line that runs towards the evaporator turns your radiator fan on when the high-side pressure gets high enough to warrant turning it on.
You are correct in that these are readily available at local parts stores.