new to gns as well ... but! here's my 2 cents...
the default display on your scanmaster (o2 mv and kr) should be kept an eye on at WOT. o2 mv give u an idea of where your fuel : air ratio sits. I've heard of ppl tuning their FP / Boost so their scanmaster reads 760-800 at WOT. I'm usually at around 815. Higher the number, the more rich you are. The lower the number, the leaner, the meaner, the more risky.
KR is VERY important to keep an eye on when on the throttle. Seeing a little knock (1-2 kr) on a shift is normal for me .... but if u see steady knock or knock over 4-5 GET OFF THE GAS!
There are other features if you tap the left function button as well ... maybe someone would be so kind to list a link here for a translation of some of these features.
HTH