Yellow/Blue light control identifies the START of the Yellow (mid-range) fuel tuning effects.
Both Rich values (downward) and lean values (upward) are shown departing from the standard baseline tracing of the black line.

-Red traces show Yellow Mode starting at 5000rpm by using a low value of Yellow/Blue, near #1
-Green traces show Yellow Mode starting at ~6500rpm by using a middle value of Yellow/Blue, near #4
-Blue traces show Yellow Mode starting at ~8000rpm by using a high value of Yellow/Blue, near #8