If, after setting up dual engine support per the above instructions, if DUAL ENGINE
SUPPORT is later changed to NO, engine timer values (such as HOBBS) displayed on
the individual EMS screens will be reset. One SkyView Classic display’s timers will
overwrite timers on all other displays.
Engine Sensor and Transducer Installation
This section explains the steps required to install and connect all sensors and transducers
supplied by Dynon Avionics. Additionally, connection instructions are given for some sensors
and transducers that Dynon Avionics does not sell, like the tachometer, fuel level, flaps, trim,
and contacts.
Engine Sensor Accuracy and Grounding
It is vitally important that all engine sensors, your SkyView display, your SV-EMS-220/221
module, and electrical system all share the same ground, and that there is virtually no
measurable voltage between these grounds.
Large currents flow between your alternator and the rest of your aircraft. The ground for these
currents is shared with your sensors. Because of the large currents involved, resistance in
grounds that cannot be seen with a simple multimeter can still lead to significant voltage
offsets. This can lead to errors in sensor readings.
These large currents exist in other places in the aircraft as well, such as between the battery
ground cable and its connection to the airframe, and along the grounding points for the
avionics bus. It is important that all of these ground paths be appropriately sized for the loads
involved, and that the connections be clean, solid, and devoid of contamination.
In particular, be sure to connect a ground wire between your engine block or avionics ground
block and any of the SV-EMS-220/221’s ground pins.
Please note that running a ground wire from the EMS to the engine block may not entirely solve
grounding issue, as this adds just a small wire in parallel with another much larger wire, and the
load will get transferred to this smaller wire, which itself is resistive due to its small size, and
thus no real effect will be seen.
Though dealing with grounding issues can be time consuming and frustrating, errors that are
seen on your Dynon Avionics Engine Monitor are caused by points in the aircraft where there is
insufficient grounding. This can lead to weak starting, hot wires, and corrosion. Fixing the
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