Don't know about Castle, but the Mezon does not readout rpm when the brake is engaged. I was hoping to get the same data. We'd need an independent tach setup but I've never pursued one.
Jim O
I don't think any of the sensorless ESCs can record RPM when the brake is engaged. Most radio brands (and Eagletree) make a variety of RPM sensors...it would need to be of the optical or magnetic variety, and not electrical.