From my own experience, I had a problem with airspeed indication, the pitot hoses in my wings, long time 10 years standing and then wing installation movements caused a number of cracks nearly around the tube which needed replacement (and opening the wing).
But you mention using a plastic...
I agree, but in case of two displays failing having still flight instrumentation and GPS data would ease the search for a suitable landing space preferrably at an (unplanned) airport much less of an emergency, so I would at least want to connect that 3rd display to the GPS and give it map...
It very much depends on what functionality you want to have available, I would consider to have the 3rd display added in a way so that it enhances the redundancies within the system to the maximum extend possible. There are a number of groups of shared signals all on the 37-pin D-connector, just...
A dual Dynon system will upon boot come to a conclusion as to what system is the master and generates the audio messages. Could it be that the audio wiring from one of the two system is not (no longer) connected properly to audio panel (?). This could be tested by just running a single Dynon...
Note that the Skyview really doesn't need a rheostat, just a variable resistance resulting in a variable voltage control towards the Skyview is all that is needed. The external control is just a 10 kohm variable resistance that is connected between gnd and 12 Volt and the variable output voltage...
According to the instructions the transponder update is included in the 17.3 package but you explicitly have to perform the update to the transponder in the transponder menu of the Dynon, this is not handled automatically
True, the obstacle and aviation are never erased by the Dynon system, if you want to remove the old databases then you would have to delete them manually from the UBS drive, possibly before downloading the new databases onto the USB drive.
And yes, that requires that you pick the latest database...
Which database are you referring to? The aviation and obstacle database? For these, when a new database is loaded from USB, it (the new release) simply overwrites the old databases, so there is no action required.
I have an SL-30 like radio connected to my Dynon as NAVCOM2, and both the TUNE COM and TUNE NAV buttons appear when appropriate and work in pushing the frequencies to the standby frequencies of NAVCOM2, so the mechanisms work in this configuration. I have a G-navigator in system too as NAVCOM1...
It is a single contact (push to make contact) switch grounding the control line to the servo's (with an additional 5k resistor over the switch to the Dynon system can detect a broken wire failure). Look in the installation manual and the users manual for the term disconnect or disconnect button...
Dynon expects Type K thermocouples for the Exhaust temperature sensors and that is what is generally used by all systems as these thermocouples provide the required range (–454 to 2,300F). So it is very likely that this will work. Looking in the Spruce catalog all listed EGT sensors are Type K...