Rpm; Rpm 2; Misc Pressure; Manifold Pressure - Garmin G3X Touch Installation Manual

RPM

The following sensors can be configured for the RPM 1 input on the GEA 24, or the RPM input on the
GSU 73:
• Electronic Ignition Tachometer Signal (1, 2, 3, or 4 pulses per revolution - Lycoming and
Continental electronic ignitions typically output 2 pulses/revolution for 4-cylinder engines and 3
pulses/revolution for 6-cylinder engines)
• Jabiru Alternator RPM (6 pulses per revolution)
• JPI 4208XX - Magneto Port RPM Sender (4- or 6- cylinder)
• Rotax Trigger Coil RPM
• UMA 1A3C Mechanical RPM Sender
• UMA T1A9 Magneto Port RPM Sender (4- or 6-cylinder)
Rotax 912iS/915iS: For the GEA 24, select "Rotax FADEC" as the RPM configuration to use engine speed
data from the Rotax 912iS/915iS FADEC interface.
NOTE
External components are required when using the Rotax Trigger Coil configuration with
the GSU 73 (see
Custom: These options allows the installer to enter up to 8 points of frequency-to-RPM calibration, using
any RPM sensor that has a known frequency output. The custom RPM configurations accept frequency
values up to either 500 Hz or 1 kHz; the lower-frequency configuration is better suited to noisy RPM
signals. Custom RPM configurations also support engine speed readouts that display in percent instead of
RPM.

RPM 2

A second RPM input is provided (RPM 2 input on the GEA 24, CAP FUEL 1 / RPM 2 on the GSU 73). If
both RPM inputs are configured, the highest of the two valid RPM values will be displayed. This
configuration is useful for aircraft equipped with dual electronic ignitions, where the tach signal ceases to
function during a pre-takeoff ignition check.
Misc (miscellaneous) Pressure
These inputs (GEA 24, J244, Pin 31; GSU 73, J732, Pin 31) allow the monitoring of inputs such as
hydraulic pressure, and allow the installer to create/enter the name of the gauge. Options of several
different Kavlico pressure sensors are provided, or if "Misc Press (Custom)" is selected, the installer can
enter up to 8 points of voltage-to-pressure calibration.

Manifold Pressure

The following sensors can be configured for the Manifold Pressure input on the GEA 24 or GSU 73:
• Kavlico P4055-30A
• Kavlico P500-30A
• UMA N1EU70A
Rotax 912iS/915iS: For the GEA 24, select "Rotax FADEC" for the manifold pressure configuration to use
manifold pressure data from the Rotax 912iS/915iS FADEC interface.
190-01115-01 G3X/G3X Touch Installation Manual - GDU 37X Config and Post Install Checkout
Rev. AC
Figure 31.3).
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