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Message: <blockquote data-quote="Rtfm" data-source="post: 1469231" data-attributes="member: 20804">Excellent questions, Ryan. I have looked for the grounds and haven’t found them, yet. I would love to know, as well. C106 is the connector under the hood on the firewall in front of the passenger seat. You can trace the wires to that connector on the way to the ECM, I think. My cruise control worked, but I was also having trouble getting the AC signal on pins 11 and 12. I could reference the voltage against another ground, however. It looked like my pin 11 and other grounds on C250 were bad. It’s a frustrating combination to chase down. Have you tried to use your cruise control to see if it works. If so, the speed sensor is functioning and the signal is getting to the ECM. Now, to test for signal to the C250 connector, connect a voltmeter for AC voltage across the pins for the signal at the connector, pins 11 and 12. You should see a voltage up to 7-9 volts, but more like 2-3 volts around 20-30 mph. If the signal is there, then your wiring should be good and the speedometer board is suspect. You can measure the resistance of the coils in the motor on the board. They should be around 187 ohms if good. S- to S + and C- to C +. I am located in TX in the DFW area.  I’ll let you know if I get those chips. I’m looking for a junker similar type Ford cluster from a similar year instrument cluster in other models right now and having difficulty finding any repair shops that will answer the phone to see if they have a lead on this chip.</blockquote>