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@Ecky and 3-Wheeler:
Y'alls posts have been super helpful. I didn't know the VSS signal got split before the ECM, which explains the speedometer stuff I was seeing. I have a physical copy of the 2000 Electrical Troubleshooting Manual, but it was a little confusing. However, I did manage to find the P31 connector that 3-Wheeler mentioned. It's referred to as MCM Connector C in the manual. It has four VCC wires, and the connector in the ECM where the VSS is has 2 VCC wires. The manual doesn't specify the voltages but I'll check the ones up front and see what they do and report back here.
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