I have searched and found some very good articles here on the A/C systems.
After some research I found that my car was already converted. It was low on 134A I added some but it is not very cool at all and the aux fan is not coming on ( am going out in a minute to troubleshoot it) Any way this car does not have label indicating it was converted so I do not know what the proper charge pressure should be on the low and high side. Any guideline such as if your R12 pressure was this you should have this after the conversion. I should add this is on the 85 300SD.
Thanks
Alan

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92 500E Silver 66k
82 Porsche 911SC 84K
68 Cadillac ( Gone Now )
03 Suburban Z71 200K
85 300SD 217k From Original Owner ( Dad )