Dynon EFISThere are three main components to install. The main unit itself goes in the instrument panel, the remote compass needs to be mounted somewhere away from magnetic interference, and the outside air temperature (OAT) probe should not be mounted in direct sunlight. Then they all need to be connected electrically. The Main Unit  I
purchased the flush-mounting bracket from Dynon to mount the unit in
the instrument panel. Because the edge of the hole will show,
I
spent a lot of time smoothing the hole and making it just big enough
for the unit to slip through. Then I slipped the unit into
the
hole and put the mounting bracket on from behind to get the exact
location of the mounting-bracket holes. Then I drilled holes
for
the screws that hold the bracket to the instrument panel.
After
everything was primed and painted, I screwed the bracket to the back of
the instrument, then screwed the bracket to the panel. The
only
down side to this setup is that I can’t pull the instrument out without
reaching behind the panel. Either I unscrew the bracket from
the
front and pull everything out from behind, or I have to reach behind to
unscrew the instrument, then I can pull it out the front.Remote Compass  There
are two main spots I have seen remote compasses mounted—either
in
a wing tip, or in the aft end of the fuselage. I decided to
place
mine in the fuselage behind the baggage compartment. I had purchased a mounting kit from Dynon for the remote compass, but would not do that again. I would just make the bracket myself out of scrap aluminum. The best part of the kit was that it had all the non-magnetic hardware. I used an extra piece of AA ¾ X ¾ across the fuselage, and a triangle piece of .032 aluminum as a gusset. Because I had the bracket from the kit, I used it on the other side to secure the aluminum angle and hold the remote compass. I riveted all these parts into the fuselage.
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I
used non-magnetic screws and nuts to hold the remote compass to the
bracket with washers where needed to shim a side. It took a
little doing to get the remote compass aligned with the main
instrument. They need to be parallel in all three
planes. I
measured from the F-808 bulkhead aft to the front of the remote compass
on both ends to ensure it was aligned with the yaw axis the same as the
instrument. I used a digital level to check “pitch” and
“roll.” The hardest one to measure was the pitch of the
instrument. I tried to measure the instrument
itself, but
it’s round shape made it hard to get a good reading, so I measured the
face of the instrument and the panel (which were the same) and then
added 90°.
I
wanted to find somewhere out of the direct sun that would cause little
drag for the Dynon OAT probe. I decided that below the
horizontal
stab would be the best place. The OAT plugs into the remote
compass. Since I was planning on mounting the remote compass
behind the aft baggage compartment, this made the wiring a lot
easier. A simple hole in the fuselage was all that
was
required for the OAT probe.