I am at a loss for words seeing the response to this. I thank everyone who took the time to reply.
My '96 has variable displacement, as this is the year MB made everything OBDII compliant (fully). '96 seems to be the break year on the compressor part #. My readings from the head unit are quite different from those posted here and when I get things working right, I will post a list of them. The only one that has me truly puzzled right now is 43, which in my car reads 'bEn'. ?? The rest I think I can figure out. Except instead of 9 in mine, it is a -9 and the reading is in degrees Celsius. Between 51 and 54 is a reading labelled -2 which says 10 degrees Celsius. A little playing may tell me more this weekend.