I think this Q&A question is more directly related:
Q&A - DC Tach Generators
Quote:
Question:
Are DC Tach Generators allowed as sensors?
If so, can DC motors be used as tach generators solely to provide a signal source to an analog input?
Answer:
DC Tach Generators are allowed as sensors.
DC Motors are not allowed per <R44>.
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I would take that to say that any DC motor (non-KOP) can not be used at all, even if for use as a tachometer.
-Nate