Garmin G3X Installation Manual page 118

8.2.7 Fuel Quantity
8.2.7.1 Resistive Type Fuel Quantity Sensors
Resistive type fuel quantity sensors with a 0–500 Ω range are currently supported. Wiring methods vary
based on the GSU 73 channel being used. Please see the interconnect documentation for proper wiring
considerations.
8.2.7.2 Capacitive Type Fuel Quantity Sensors
The P-300C receives a +5V excitation input from the GSU 73 and outputs ±5V square wave from 600 Hz
to 3.8 KHz. See Appendix G for proper wiring considerations.
8.2.8 TIT (Turbine Inlet Temperature) Sensor
Sensor Description – Type K grounded thermocouple probe with screw-in type adapter. This type of
sensor is applicable to all turbocharged engines.
General Installation Guidance – To maintain G3X Engine Indicating System (EIS) measurement
accuracy, thermocouple (TC) wire must be connected directly to the inputs of the GSU 73. If the supplied
sensor wires are not long enough to connect directly to the 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. One such example of appropriate wire is TT-K-22S Type K
thermocouple wire from Omega Engineering.
8.2.9 Bus Voltage Monitor
Refer to Appendix G for interface drawings.
Page 8-14
Revision E
G3X Installation Manual – Engine Sensor Installation and Configuration
190-01115-01