Garmin G3X Touch Pilot's Manual page 115

If a fuel flow sensor is configured, the fuel flow value detected as the first cylinder
peaks is saved. The fuel flow corresponding to peak EGT is drawn on the fuel flow
gauge as a hollow blue pointer. This can be used to determine if you are on the rich
side of peak (ROP) or the lean side of peak (LOP). Rich of Peak (ROP) if the fuel flow
pointer is above the blue triangle, or Lean of Peak (LOP) if the fuel flow pointer is below
the blue triangle.
The EIS displays the cylinder whose temperature is currently closest to its own peak
value (when Lean Assist Mode is active) as a white pointer with the cylinder number.
The peak temperature is depicted by a hollow blue pointer, and the temperature
deviation from peak (∆EGT or ∆TIT) is displayed in place of the normal temperature
number in cyan text.
190-02472-00 Rev. D
Fuel Flow Cor-
responding to
the peak EGT
Fuel Flow Gauge - Lean Assist
(Fuel Flow Sensor Configured)
Cylinder with the
Temperature Closest to
Its Peak Value
Lean Assist (EIS) (Example)
Garmin G3X Touch ™
Difference
Between
Present
and Peak
Temperature
Cylinder Peak
Temperature
Pilot's Guide for Certified Aircraft
EIS
93