I think that RV7A Flyer is thinking of the AOA calibration associated with the Dynon Deluxe Pitot Probe, which displays various levels of AOA on the PFD in multiple colors. As he so eloquently stated, there's a Dynon procedure for calibrating this and I'd recommend that you follow it. However, I'm thinking that you have the same issue I had back when I first powered up my airplane: a loud squeal tied to the Van's AOA mechanical probe with a tab sensor in the left wing leading edge. No need to comb your neck: this was an option that you and I got with the Van's kit and it merely warns of an impending stall. You can set it to go off with whatever margin above the stall you want and most RV's don't even have one. It's wired from the wing to a small, independent circuit board (mine's on the firewall) then directly to your audio panel so any Dynon calibrations will have NO effect on the warning, i.e., it's a completely independent system. Without hiking out to my hangar to verify (i.e., check your installation guide), I recall the installation as very general and uncalibrated because there are no marks to reference inside of the wing where the unit is mounted. I merely opened the access panel and reduced the AOA of the unit incrementally, comparing when the squeal occurred as part of my fly-off. Once I had it set where I wanted it, I left it alone. Also: there's no volume control for the squeal and mine was pretty loud so I installed an inline resistor to lower the intensity. I had this all checked out by our local avionics shop and they verified that it was done properly.
Hope this helps!
RV-8 N798RT
IO-375
Dual 10" Skyviews