190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page F-4
F.3.2 Additional Equipment Required
• Cables: The installer will fabricate and supply all system cables.
• An example of mounting hardware is: #10-32 pan or hex head screw (4 ea.) and #10-32 self-
locking nut (4 ea)
• Air hoses and fittings to connect pitot and static air to the GSU 73. The GSU 73 has a female
1/8-27 ANPT fitting for each pitot and static port. Use appropriate aircraft fittings to connect to
pitot and static system lines.
F.4 Unit Installation
Fabrication of a wiring harness is required. Sound mechanical and electrical methods and practices should
be used for installation of the GSU 73. Refer to Section 2.3
for wiring considerations, and to Appendix F.5
for pinouts.
Connector kits include backshell assemblies. The backshell assembly houses the configuration module
(P732 only) and a thermocouple reference junction (if applicable). Garmin’s backshell connectors give the
installer the ability to quickly and easily terminate shield grounds at the backshell housing. The
instructions needed to install the Jackscrew Backshell, Configuration Module, and Thermocouple are
located in Section 22
.
F.5 Pinouts
F.5.1 Connector Description
The GSU 73 has one 62-pin connector (J731) and one 78-pin connector (J732) located on the connector
end of the unit, as shown below. J731 and J732 are clearly marked on the connector end plate.
Figure F-2 Rear View of Connector End Plate
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