You seem very engineering oriented.
Why would you do ALL this work and not spend $$ on a gauge to monitor your results????
Here is a link to the ScangaugeII used by most on this forum:
http://ecomodder.com/forum/showthrea...eii-23306.html
W/ a scangauge (or similar item) you can add an item and test it. Then reset the gauge and take the item off and test it.