You've got two options in the KOMBI module.
BC_DIGITAL_V_KORREKTUR - which obviously corrects the digital readout, and
BC_V_KORREKTUR - for the speedo.
That said, I've not actually tried it. I like the over read as default with the option of looking at the real speed on the digital display. It's bloody accurate too, always bang on with my TomTom.
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