Following the update of the G3 graphic engine monitor to V1.78 or higher or all versions of the G4 graphic engine monitor the vibration analysis screen will now appear among the supplementary screens when the PG knob is turned.  In order for the vibration analysis to function your G3/G4 must be equipped with a vibration sensor and a connection to the magneto for RPM measurement.  This vibration sensor is just what you need and this is new old stock...never installed before!