I just tried it again just as you describe it and only the sensor values come up. I didn't write them down this time, but I did the last time and they looked just fine.
I searched the archives and saw someones post having the same problem as I do, but unfortunately he did not post how he resolved showing the TDCs.
Aparently some of the AC components changed with the '95 models. Anyone knows what I need to do to get the errors.
'07 ML320 CDI (398 ft lbs / 1400 RPM)
'91 928 GT Supercharged