MGL Avionics Stratomaster Maxi Single Flight II Manual page 23

Various pickup / sensor installation possibilities
+5VDC
RPM
GROUND
Rotax DCDI setup (Ballast resistor optional)
+5VDC
RPM
GROUND
Magnetic pickup with Hall effect sensor
White
+5VDC
RPM
GROUND
No marking
Magnetic pickup with active gear tooth sensor
+5VDC
RPM
GROUND
Optical, reflective sensor
Grey rev counter wire
Ballast
resistor
Brown wire
(engine block - ground)
2K2 resistor
Hall effect sensor
Red
1K resistor
Honeywell gear tooth sensor
220, 330 or 560 ohm resistor
2K2, 3K3 or 4K7 resistor
Magnet
Note: On Rotax DCDI
ignition systems it
may be required to
install a ballast
resistor as shown. A
typical value is 220
ohms. Many
installations can
omit this.
Typical hall effect
sensor installation
detects the passing
of a magnet suitably
fixed to prop flanges
or shafts.
The gear tooth
sensor is a popular
pickup used on the
pre-rotation gear of a
gyro plane.
(rotor speed
indication)
The optical reflective
pickup can provide a
simple means of
contactless RPM
sensing in difficult
installations.