Berlouin,
Forgive me, I wasn't suggesting you use the Lynch as it was clear you'd chosen HPEV AC20. I was more trying to saying in the various posts that Graeme Hawksley of Hybrid Marine in UK has switched to brushless from the brushed for generation. I'm not sure why you think the Lynch etc can't do 72V, as the Lynch and Saietta go to 110V and 72V respectively per the attached PDFs.
As regards checking your shaft RPM this inexpensive tacho should do the trick. I have one and it works just fine:
https://www.amazon.co.uk/HDE-Professional-Digital-Infrared-Tachometer/dp/B00850ZCRI/
With my DC Lynch of course I can measure voltage at the motor and multiply that but the RPM/Volt 'constant, of course that is a no load constant so the combination of the voltage and tacho reading helps me be confident of the loaded shaft RPM speed.
John R
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