It could be, but the motor could also effectively "step", albeit in tiny increments. Like I say, I don't know, and it's my best guess.
The simple way to do it is with a shift light. Set the shift light to say 8000rpm, and instead of a light coming on, actuate the servo instead. You'd need to figure out how to stop the servo at the required full open/full closed positions to stop it simply straining the motor against a physical object such as the port roof or taught cable, but it wouldn't be hard.
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Andy.
NSR-WORLD.COM
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