VCDS (VAGCOM) and AdBlue/DEF/SCR level information

The page and video from myturbodiesel.com (here http://www.myturbodiesel.com/1000q/audi-q7-tdi-dpf-faq.htm and here [URL="http://youtu.be/z7kkQJO_Oaw) shows"]http://youtu.be/z7kkQJO_Oaw) shows[/URL] a Touareg TDI having advanced measuring blocks of 838 and 849 to show the "reducing agent" aka AdBlue, DEF, or SCR, in Control->Engine->Adv. Measuring Values. The Q7 TDI (2011 MY) doesn't show that and stops somewhere in the mid-700's. There are some SCR values to read, but only a voltage for the level along with amount in grams (I presume) of DEF used. Do I need to infer the level based on a certain filled condition with the difference in mass of DEF used or is there a table of voltages to actual levels? That is given in mV as I recall. Or is there a location in the AdvMeas. block that I am missing?

TIA!