That is a lovely bit of kit
Some minor discrepancies are immediately obvious. The Garmin is giving you a GS of 153. The Dynon a TAS of 185 and a headwind of 28 kts. Obviously those don't add up, even though it is a matter of a couple of kts.
I got a bit anally retentive when I was 'testing' a new-build RV8 and ended up flying a million square patterns and entering all the data into a fancy spreadsheet produced by one of the American aircraft test schools (I can't recall what the website was but I can research it if you wish). The Dynon Skyview was pretty much spot on but the standby ASI needed a bit of attention (my solution of never looking at it was not an acceptable method
)
If you need anyone to fly the 8, 10 or your Gazelle, just give me a shout
Edited to add photo. This is pretty typical of what I've seen in the RVs I've flown. This was early on in the testing before we managed to sort out the oil temp probe under-reading