Carrier A-series RTU question

Have 2 A-series VAV RTUs that share common duct, both run a same time, no isolation dampers. Trying to find a way to write the speed from one to the other so they track together. Found a writable but it only works when unit in test mode. Anyone come across this problem? Anyone come up with solution? Thinking of adding dampers and running lead/lag but that is not spec.
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