The Yellow/Blue Mode light adjustment identifies the START of the Yellow Mode (mid-range) fuel tuning effects, and was used to create the series of motor runs.

A rich value was used for the Yellow Mode (mid-range) in all of these runs, with Yellow Mode set at light #8, and in each case is shown departing from the standard baseline tracing of the black line at varied rpm.

-Lower rpm air/fuel lines show Yellow Mode starting at 5000rpm by using a low value of Yellow/Blue, near #1
-Middle rpm air/fuel lines show Yellow Mode starting at ~6500rpm by using a middle value of Yellow/Blue, near #4
-High rpm air/fuel lines show Yellow Mode starting at ~8000rpm by using a high value of Yellow/Blue, near #8