Totally unrelated to the prop change. Speedometers are either pitot, paddlewheel, or GPS. Not sure how you'd calibrate on aVLX. On my pitot speedometer (Airguide) there is a knob you turn to calibrate it. It can also read off if plugged, but changing to a tournament flow through style pitot fixed any plugging issues I had. My other speedo is on the Perfect Pass and is paddlewheel, there is a calibration for that buried in the PP menus, I check calibration of both to my phone GPS once a year when I'm on a lake, or if it ever seems off I verify at slack tide on the river. Charlie, GPS is not an upgrade over a paddlewheel for anyone on a river, tidal water, or anywhere with a current. I've been anchored and seen my paddlewheel reading 10 MPH when turning the key on.
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