Sorry for the late reply.

Speed sensor is taken from the cluster mate, I can remember which pin it on , but you need to tap the wire.

Other on is reverse signal (just hook it to the rev lights, i think).

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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.