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In the UI, I can pull the inner knob to show the currently set VS, but is there a simvar that I can change the state to do this so I can hook it up to my hardware?
I don't have the Bonanza yet, just the Baron, but I think this should give you what you are looking for:
https://community.justflight.com/topic/5866/kas-297b-altitude-selector-analog-baron
That worked like a charm, thanks!