05-08-17, 10:14 PM
The common Black/Blue wire is almost certainly ground (easy enough to test).
In which case the White/Red from the engine pickup (14) is the crank position pulse.
After that it’s guesswork: the Blue and Yellow ones to the TPS (15) will be a positive supply (probably 12v via a resistance) and the return voltage from the wiper of the potentiometer in the TPS, but you’d need to do some measurements to find out which is which.
The Blue/Yellow wire from the speedo (17) looks like it probably carries the pulses from what I assume is a Hall Effect sensor which detects the magnetic poles from the plastic rotor. Which would leave the White one as a supply rail which may be 12V, or less, or they could be the other way round.
I don’t fully understand the role of the speed sensor, I’ve had it fail and not noticed any adverse effect on running, but many say otherwise. Ignition advance required can be determined from the engine revs and the TPS, I can’t see why road speed would need to be taken into account.