190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 21-27
Figure 21-17 Magneto Tach Sensor Installed
21.3.5.2 Electronic Ignition RPM
For engines with electronic ignition, RPM can be sensed through a digital tach signal output from the
electronic ignition system. The G3X system provides configurations for ignition systems that output 1
through 4 pulses per crankshaft revolution, or a custom RPM input configuration may be used to
accommodate other types of electronic ignition.
Aircraft with dual electronic ignition systems can connect the tachometer signal output from the second
ignition to the GEA 24/GSU 73 RPM2 input (see Figure 27-2
). The RPM value displayed on the RPM
gauge will be the higher of the two RPM signals.
NOTE
Electronic ignition systems with open-collector tachometer signal outputs may require a
pull-up resistor between the tachometer signal output and +5VDC or +12VDC.
To Next Page
