To calibrate the mk4.

Get onto a motorway and travel at a constant 60mph for 15 - 20 minutes and this should sync the speed sensor to the cars GPS signal.

Remember no speeding up or slowing down, keep the speed constant, (set the cruse control).

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.