TruTrak EMS BU (8300-065) - Manual (Page 12)

TruTrak Flight Systems 10 EMS Installation Manual
JUNE 2009 8300-065 Rev D
Tachometer
Connect a shielded pick-off from the Magneto or electronic ignition box, ground the shield at the ignition
source. See installation manual for the installed electronic ignition box.
The Rotax 912 engines have a 5th trigger coil for the purposes of electrically monitoring rev counts. This
trigger coil outputs to a two-wire harness. Connect either of the two wires to ground. Connect the other
wire to the TACH input on the EDM.
Manifold Pressure Sensor HOSE (82509-047)
The pressure port on the manifold pressure sensor input requires 1/8” inner diameter tubing for a secure
fit. You may need to use adapters to convert up to larger inner diameter tubing for your specific engine. It
is recommended that you use clamps at every transition point
Oil Pressure Sensor (8250-032)
Lycoming / Continental engines must install the TruTrak OP sensor supplied.
Note that if you are installing on a Jabiru or Rotax engine, your engine comes with a
pre-installed oil pressure sensor. You will need to replace this sensor with TruTrak
supplied sensor assembly.
Fuel Pressure Sensor (8250-040)
First, mount the fuel pressure sensor to a fixed location using an Adel clamp or other
secure method. The fuel pressure sensor must not be installed directly to the engine due
to potential vibration problems. Next, connect the fuel sensor to the engine using
appropriate hoses and fittings. Its pressure port has a 1/8-27 NPT pipe thread fitting;
you may need adapters to connect to the pressure port on your engine. Locate the
correct fuel pressure port for your engine. This port must have a pressure fitting with a
restrictor hole in it. This restrictor hole ensures that, in the event of a sensor failure,
fuel leakage rate is minimized, allowing time for an emergency landing.
Carbureted engines: Use the supplied sensor and harness.
WARNINGS:
Due to vibration issues, never connect the sensor directly to engine.