SkyView SE supports only one SV-EMS-220 or SV-EMS-221. If your aircraft has dual
engines, or more than 7 cylinders (monitoring CHT and EGT for each), SkyView SE is
not recommended. Thus, instructions for installation and configuration of a second
SV-EMS-220 or SV-EMS-221 in this section is not applicable to a SkyView SE system.
This section contains information and diagrams that specifically apply to the installation of the
SV-EMS-220/221 Engine Monitoring module and compatible transducers and sensors. After
reading this section, you should be able to determine how to prepare an installation location,
how to mount the module and its transducers and sensors, how to make all necessary electrical
and transducer and sensor connections, and also how to configure the SkyView system for the
installation’s engine parameter sensing.
Dynon Avionics offers two engine monitor modules for SkyView. The SV-EMS-221 is only for use
with the Rotax 912 iS and MW Fly (Metalwork) AEROPOWER engines. Conversely, the SV-EMS-
220 cannot be used with the Rotax 912 iS or the AEROPOWER engines.
On the SV-EMS-221, pins 27, 28, 36, and 37 are used for communication with the Rotax 912 iS
and AEROPOWER engines and related systems. On the SV-EMS-220, pins 27, 28, 36, and 37 are
used for optional CHT/EGT inputs. Except for the different functions of Pins 27, 28, 36, and 37,
the SV-EMS-220 and SV-EMS-221 are electrically and operationally identical.
The Rotax 912 iS and SV-EMS-221 combination has a unique and somewhat simplified
configuration compared to other engines – see the Rotax 912 iS example section below for
further details.
Support of the SV-EMS-221 with MW Fly (Metalwork) AEROPOWER engines is solely provided
by MW Fly and their partner airplane manufacturers and dealers.
SkyView Classic can fully monitor CHT and EGT of all cylinders in a 9-cylinder radial engine if
dual SV-EMS-220/221s are installed (up to 28 total CHTs/EGTs). Dual engines can be fully
monitored by installing dual SV-EMS-220/221s. Note that for dual engine monitoring, at least
two SkyView displays are required; each engine’s data can only be displayed on a specific (user-
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