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an accessory display only you may wish to match the speed
displayed to the same as what the vehicle speedo shows,
in that case you can use the Speed Adjust menu option and
adjust accordingly. When deciding the adjustment, it’s
easiest to note the speed at 100km/h and compare the
result between the vehicle displayed speed and the device
display, adjustments to this setting should not be done
while driving.
If you wish to convert the output from the ECU to a more
accurate reading than the factory speed displays a suitable
method is to use a GPS smartphone app to measure the
vehicle at 100 km/h and then adjust the speed offset menu
to match to give the correct speed.
[Note] No menu adjustments should ever be made while
the vehicle is in motion, any required settings such as speed
offset should be noted and only adjusted while stationary.
