not sure if these will help but from the looks of the one the white/orange IS speed control.
What I have read is that the Power Control Module converts the ac current from the vss sending unit(s) to a square dc pulse signal. I don't know much about electronics but apparently this is the signal that is interpreted by a microprocessor in the gauge cluster to give a reading of your traveling speed as shown on your speedometer. If someone has a more accurate explanation, please jump in.What sort of electrical signal is this wire supposed to generate? I'm curious for other reasons.