ok, tried it:
1. car running
2. temp wheels to white area
3. pressed left and right auto buttons and waited 20 sec
4. pressed Rest for 5 sec
5. pressed Auto and the numbers appeared.
...so I wrote them down, and they seem normal. The interior temp (#1) is nice too...funny watching it change when I put my hand over the sensor and hearing the AC kick in as the temp increases.
But...it only works once after starting the car, to do it again, I have to turn the car off and back on..no big deal.
I can't do the one for the DTC codes though, and I only get 1 through 9 and #16..not the 50 like in the 95 model S class.
nice to have..I always wanted to know useless gauge readouts...and I hope I dont have to use them to see what might be wrong..
-Apine CD changer