Garmin G3X Touch Installation Manual page 758

Twin-Engine Configuration – If two EIS LRUs are configured, each engine-related parameter can be
configured as either "Single Engine" or "Twin Engine". If "Single Engine" is selected, data for that
parameter will be acquired from EIS LRU #1, and displayed using a normal gauge. If "Twin Engine" is
selected, data for that parameter will be acquired from both EIS LRU #1 and #2, and presented on the
display using a dual gauge. The gauges for both engines will use the same configuration. Airframe-related
parameters such as fuel quantity or trim/flap position do not support twin-engine display, i.e. these
parameters are supported on EIS LRU #1 only.
190-01115-01 G3X/G3X Touch Install Manual - GDU 4XX Config and Post Install Checkout
Rev. AC Page 34-140