Whoah! Some of this is leaving a vapor trail over my head. Do you mean to say that I can monitor system pressure through the PBU on a '96?
Just got home from the shop. The new compressor is in but is circulating liquid. The vapor phase does not occur. Apparently the compressor took out the expansion valve too. Back to the shop Friday to have a new one put in. In the meantime we disconnected the new compressor electrically to ensure nothing happens to it for the next day.