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@Brucepick:
Ecky's diagram, a few posts above, shows the VSS is split, sending a separate signal to the speedo and to the ECM. I wired the switch after the split on the ECM side, so the speedo should work fine. My next task is to get a different resistor on the timer to make it pulse more slowly (target is 2hz) and to power it with a 5v source from the car. There's two pins on the ECM connector I want to look at.
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