Garmin G3X Installation Manual page 260

21.3.2 EGT (Exhaust Gas Temperature)
Sensor Description – Type K grounded thermocouple probe with integrated clamp for mounting in an
exhaust pipe.
NOTE
If ungrounded thermocouples are used, the low side must be taken to a GEA 24/GSU 73
ground pin.
21.3.2.1 Engine Sensor Installation
General Installation Guidance – To maintain G3X Engine Indicating System (EIS) measurement
accuracy, thermocouple (TC) wire must be connected directly to the inputs of the GEA 24/GSU 73. If the
supplied sensor wires are not long enough to connect directly to the GEA 24/GSU 73, then Type K TC
extension wire must be used. To minimize risk of breakage, it is recommended that a high quality stranded
(as opposed to solid) thermocouple wire be used. TT-K-22S Type K thermocouple wire from Omega
Engineering is one such example of appropriate wire. Thermocouple extension wire lengths may vary
between cylinders for installation convenience; there is no requirement to use the same length of
thermocouple extension wire for each engine cylinder. However, for each individual thermocouple lead,
the positive and negative wires should be the same length. When attaching thermocouple extension wire
with splices or connectors, the connections for an individual pair of positive/negative wires should be
located close together to ensure they are exposed to similar ambient temperatures.
When using Alcor Type K probes, refer to Alcor EGT Installation Instructions (P/N 59180) for complete
installation details. Engine manufacturer's guidance should be consulted and followed for proper location
of EGT probes.
190-01115-01
Rev. AA
Figure 21-4 One Piece CHT Probe Installed
G3X/G3X Touch Installation Manual - Engine/Airframe Sensor Installation
Page 21-16