Turns out the A/C system has a leak. Jumping the bypass did not reveal this. I had to jump the compressor clutch to engage it manually. That allowed me to get pressure readings on the low and high side. Adding r134A got it working again but after several days the pressures drop and vent air becomes luke warm.
Next order of business is find the leak. Does anyone know if the detection dye you buy at the auto parts stores can be seen with anything other than ultra-violet? I have LCD lights but don’t know if that will work.