Is there such a thing as a chart of acceptable range of values for sensors. Specifically, the MAF and O2 sensors? '99 Mercury Sable wagon 3.0L DOHC Duratec 24 valve engine

2000 Ford Taurus Duratec 30 DOHC This post is mostly to confirm I'm not crazy. First, am I reading the dipstick correctly? And are my conclusions correct? After recently replacing fuel injectors, today had my oil changed at my local mechanic. I went straight to my place just 2 minutes down...