Thanks for the reply!
Im not sure what you mean though. How can you see the knock levels when you are on the map trace screen? What mode does the map trace need to be in when doing the run? There is a mode that just floats the cursor around the screen, and one that looks like it traces the line across the screen as rpm/load increases.
Apologies for getting back to basics, as I said - I'm a noob when it comes to the tuning side of PFC