iRacing not connecting to SimHub

I am having an issue where iRacing is not connecting to SimHub when I launch a race - it worked before, but ever since I switched my gear indicator and rev light to the same Arduino board iRacing will not work with SimHub. All of my other games work perfectly with the displays, shaker motors, etc, but I have no idea where to start with fixing it for iRacing.

Is there a common culprit for SimHub showing iracing as "not connected" when the game is running?
 

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