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I'll probably have time to poke under the dash today and get some data.
Step one: to make a signal generator to replace the vss signal.
Step two: link the new vss signal to the throttle position sensor so that when the accellerate button is pushed, the 'fake' vss signal will increase. This should fix the problem of the cruise pushing the throttle to wide open due to a lack of feedback. It also means I don't have to hack into the cruise control itself. Unfortuneately, the TPS signal is variable voltage, not variable pulse like the VSS.
As I write this, putting in a ford MAF sensor and linking to that like another poster did is starting to sound like a simpler solution.
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