Vega EMS-1 Operating Manual
Page 53
11.3.2 RPM 1 Input Dipswitch settings
Setting dipswitch 4 to the “ON” position (default) enables a high frequency filter in the
RPM 1 signal path. Some installations (direct coupling to a Magneto device for
example) will require this to be switched “OFF”. Dipswitch 4 is the closest switch to the
edge of the PCB.
11.3.3 Engine RPM connection guide
Engine
Connection / Sensor
Pulses per
revolution
220 Ohm Ballast
resistor
Rotax 447
Connect the grey wire from the engine to the
RPM input
6
Certain installations,
see note below
Rotax 503
Connect the grey wire from the engine to the
RPM input
6
Certain installations,
see note below
Rotax 582
Connect the grey wire from the engine to the
RPM input
6
Certain installations,
see note below
Rotax 618
Connect the grey wire from the engine to the
RPM input
6
Certain installations,
see note below
Rotax 912 (S)
Connect the rev counter wires (blue/yellow and
white/yellow). One of the two wires needs to be
connected to ground (engine block) and the
other to the RPM input.
1
Insert ballast resistor
Rotax 914
Connect the rev counter wires (blue/yellow and
white/yellow). One of the two wires needs to be
connected to ground (engine block) and the
other to the RPM input.
1
Insert ballast resistor
Engines with
magnetos
UMA Tach Sensor
T1A9-1 (Slick)
T1A9-2 (Bendix)
Connect the red or orange/white wire to 12V, the
black or blue/white and braid to ground. Connect
the white (signal) to the RPM input
1 pulse per revolution on
4-cylinder, 2 pole
magnetos
1.5 pulses per revolution
on 6-cylinder, 2 pole
magnetos
Certain installations
HKS engine
Connect the orange wire from the CDI unit to the
RPM input
1
no
MTH engine
Connect the green wire from ignition sensor to
the RPM input
2
no
Werner engine
Connect the yellow wire from ignition sensor to
the RPM input
2
no
UL Power
Connect the ECU pin 9 to the RPM input
2
no
Note:
Some Rotax engines may require that a 220 ohm ballast resistor is fitted between the rpm
input and the ground terminal. This resistor should be fitted if you cannot obtain stable RPM
throughout the range regardless of any setting of the rpm counter sensitivity adjustment.
