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On my old Corolla, the VSS signal is actually generated right there in the combination meter from the speedometer cable. I think I'm as close as I can get. Plus, the speed portion of the MPGuino was working perfectly when it was working.
I ran a new ground straight to the negative battery terminal and still had the same exact problems.
I definitely agree with you about the 14.5V not being the problem. I'm thinking that maybe the voltage regulator has blown/gone bad and I need to replace it. Bummer.
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