AC not working

Ok fellas, so as some of you know, I bought a '75 Scamp a little while ago. It has AC, but it is not working.
While I save $$$ for the 383/727/8.75 swap, my plan is to cruise this for a year or so.
Eventually, I will deep six the AC, but until then........I would love to convert this to 134a and try to get the AC functional.

Where would you even start?

Find the pressure switch and with the car running and the AC turned on, unplug the pressure switch and cross the two terminals in the plug. Make sure the compressor comes on and works and doesn't make any noises or is locked up. If it does, you got that much outta the way. The pressure switch will be in the low side line. The big line.