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Turns out it wasn't the fans so much as the check engine light which was on at the same time. Residual voltage was carrying around from my check engine indicator on the FB and bumping up my tach and speedo values. Replaced check engine voltage divider with a relay that made car PCM happy. Speedometer still unstable with high spikes. Tach I think is figured out.
Still like to hear from somebody else that got to this to work in a car.
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