OK, now y'all have me thinking again. I can find peak RPM by ear, but I don't know if I am hitting the RPM's (right prop) I should or if I am idling as low as I should. These were the "tuning" parameters I was seeking to dial in. The TNC is a bit pricy, but I'll look around at the other suggestions and figure out how to proceed.

Thanks for the great info!!!

Jack