[Veek]

First, let me thank eah of you. I've posted my dilemma on several sites and this is the first one that actually offered some concrete assistance.
The box takes the input from the temp probes in the evaporator as well as the input from the thermostat temp setting and uses the data to cycle on and off the compressor and condenser fan. I've bybassed the controller as suggested and it simply runs the compressor all the time it's on. As noted, the
A/C on these cars is "balmy" at best and cooling is nothing to write home about. But it is better than nothing. Given that, I'm not too concerned about coils freezing, especially here in Florida.
Hersh, I'm spending some time with the Vintage Air book and it seems to me I can build someting to replicate the process as you all have suggested.
The system already has high and low pressure compressor cutoffs so that isn't a concern at the moment.
I've attached a photo of the controller's internals. I've got them with a computer repair guy who is going to try to bench test the components to see if one is out.