It's working beautifully. Refrigerator temperature is 37F @ #5 on the thermostat. Freezer ice trays have all set and it's cycling correctly. Did I mention it's whisper quiet?
David, I can't thank you enough. Your expertise saved yet another vintage refrigerator. Man, you're on a roll!
I also want to thank wholeheartedly John (Combo52), for all his advice and help.
A big thank you to Jeannine for the schematics. And thanks everyone for their advice and encouragement. Next stop, COSTCO!
BTW, David, yes, I had removed a large, one piece fiberglass mat from the back of the refrigerator in order to see where the wiring was going. It was far easier to remove than to put back! I'll post a few more pictures of the compressor compartment before I button it up.