Did one more test with GPS and speedometer reads 2 MPH slow at 60 MPH (actual 62). So the existing calibration thats in memory is -11.8% do I just add +3.3% from the -11.8% ? Since the +3.3% will show both speedometers @ 60 MPH. So in this case would I calibrate the speedohealer to -8.5% ?
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