If what I've found is accurate, the speedometer itself takes the VSS AC signal and converts it to a DC output that is then sent to 3 other components. The receiving components are ECCS (ECU), Power Steering and Cruise Control. So the ECU itself does not tell the Power Steering Control Unit to adjust the amount of assist.
At the moment I am attempting to confirm what type of output the speedometer is sending. Some search results state its a frequency output of 2Hz - 120Hz, others listed it as a PWM ranging from 0v to 5v, and all of them agree its DC.
I'm still digging through related posts on the forum here as well, though a lot of links on older posts are dead.
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Following on from the link to project binky, does anyone have any links to any other good YouTube stuff like this?
I'll add a few more below
V8 mx5 build, plus a few other good projects on his channel. Also notice in one of the videos he is drinking from a project binkey mug
Roadkill- great videos, especially the early ones
http://youtu.be/qRh5KIVO3CM
Project gramps- I'm sure most will have seen mcm
And the last is quite interesting but a bit slow
Enjoy
Hopefully I can discover some new things too