Figured I would throw out some info on afr's and what they mean. After my install of my AEM UEGO today, I have been doing a lot of research to educate myself and figured it might help the next guy to have the info in one place. So, here's some links to read up on and hopefully better understand what your looking at. Hope this helps!
http://www.international-auto.com/f...-on-reading-gauges-air-fuel-ratio-monitor.cfm
http://www.enginebasics.com/EFI Tuning/AF Ratio Basics.html
http://en.m.wikipedia.org/wiki/Fuel_mixture
http://en.m.wikipedia.org/wiki/Stoichiometry
http://www.turbobygarrett.com/turbobygarrett/airfuel_ratio_tuning_rich_vs_lean
http://www.international-auto.com/f...-on-reading-gauges-air-fuel-ratio-monitor.cfm
http://www.enginebasics.com/EFI Tuning/AF Ratio Basics.html
http://en.m.wikipedia.org/wiki/Fuel_mixture
http://en.m.wikipedia.org/wiki/Stoichiometry
http://www.turbobygarrett.com/turbobygarrett/airfuel_ratio_tuning_rich_vs_lean