Trying to clean up some loose ends on the build. There is insufficient information in the literature for the Vintage gauge set so I am looking for someone who knows more than I at this point. I know how GPS works, so I do not understand what there is to "calibrate" on it. Is this requirement in the instructions left over from older, non-GPS versions? Or is there some mechanism in the gauge that needs to be synced with the antenna?

I have about 40 miles on the speedometer go-karting up and down my street.

The directions are adamant that the speedometer will not work without calibrating it but it seems pretty darn accurate as is both in speed and mileage.

Question is, once I get it legal, out on the street, and can maintain a constant speed, (as per the instruction manual) do I really need to do a calibration on it or not?