Garmin G3X Installation Manual page 117

UMA N/T1A9-X
The magnetic pickup tach sensor is installed in the magneto bleed port. It is recommended that it be
installed in the non-impulse magneto, but it can be installed in the impulse magneto if only one magneto
exists (engines with single electronic ignition). The N/T1A9-x sensors are suitable for non-pressurized
magnetos only. Given that the bleed port size on Slick and Bendix magnetos differ, the installer should
verify that the sensor part number is appropriate for the magneto type.
1. Remove the existing vent plug from the magneto bleed port (Figure 8-15).
2. Lightly apply thread sealer such as Loctite 242 (or equivalent) to the threads of the sensor. Be
careful not to apply too much, and ensure sealer is applied only to the threads and not the pickup
face itself.
3. Install the sensor into the port (Figure 8-16). The sensor should be installed finger tight plus 1/6
turn. Do not over-tighten.
4. Connect the supplied connector to the appropriate inputs on the GSU 73 as referenced in the G3X
interconnects in Appendix H. Secure the connector and wire assembly to an appropriate location
in the engine compartment to provide strain relief.
G3X Installation Manual – Engine Sensor Installation and Configuration
190-01115-01
Figure 8-15. Magneto Bleed Port
Figure 8-16. Magnetic Tach Sensor Installed
Page 8-13
Revision E