Hmm, the Power Commander V for the fuel injected 250R I believe can log throttle position and RPM (though possibly only with the LCD-200 optional extra).
I can't recall if the US 300 is fuel injected but if so perhaps there's a PCV available for it?
Bonus side effect of engine remapping, option of a quickshifter, launch control, pit-lane speed limiter... :-)
Cheers, Pete
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