One of the things that confuses me, due to my poor math skills no doubt, is that there is one pulse from the sensor per revolution which by my calculations comes to 180KHz at 3000 RPM. Clearly, I'm not understanding something.

I did review the video I took running the signal generator up and down and it looks like 1K Hz is pretty close to 6000 RPM.

Lets see if this link to the video works.
https://photos.app.goo.gl/dwKmuy9rRsa3awst5

Michael

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