Did you try the recalibration function on the Dynon?
RV-4 fastback thread and Pics
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VAF 2022 paid VAF 704
The information that I post is just that; information and my own personal experiences. You need to weigh out the pros and cons and make up your own mind/decisions. The pictures posted may not show the final stage or configuration. Build at your own risk. Further more, these are my opinions and not those of Van's Aircraft.