Thank you for your explanation. It means that the Tinley Paddlewheel transforms the NMEA GPS speed sentence to the same signal as a real Paddlewheel, and not to a NMEA sentence speed thru water. >>
GPS Speed to Log Speed ( VTG > VHW )
So the NMEA Paddlewheel outputsignal must be connected directly to the B&G mainprocessor as shown in your wire diagram and not to the NMEA input at the B&G junction Box.
with best regards
SM 69 Yin Yang