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VSS was the speed signal, and was either from an ABS sensor, or from the transmission.. (whatever the ECU was using was my guess).
I only made one, so I can't answer the OPs question about colors sorry, but, I do know how to find the answer..
The arduino is looking for a signal change, and so if you take a wire and repeatedly short and open it to ground, you would figure out what that wire does - you might want to do that with a 10K resistor between the wire and ground..
Also, VSS required calibration, different ABS sensors or transmissions gave out different signals and so you had to find the correct multiplier.
And Inj Pulse had the same task required. There used to be a page out there which gave some common figures.
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