During my 2/6/2019 flight, I noticed the left CHT needle on the Dynon was fluttering between 130-145, while the right CHT needle was steady. That was with the cowl flap fully open; with the cowl flap fully closed, both needles were steady. I've never seen the fluttering before.
On the ground, I did not see any problem or change in the sensor or the connector to it and or it's wire. Wiggling the wire next to the connector did not cause the needle to wiggle. Note that the Left CHT is on the upper left, front corner of the engine; the Right CHT is on the upper right, rear corner. The left air inlet on the cowl blows air almost directly in the upper left, front CHT (the right/rear sensor shielded from the right cowl inlet), so it's hard for me to imagine how the airflow from the cowl scoop could affect it.
Any ideas?