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    No speedometer or shifting into 3/4

    Running out of ideas. This is on the 89 chevy with a 03 burb donor. Won't shift into 3/4 and no speedometer. Checked resistance on the vss wires from the plug to the ecm. Both good Thought I messed the tac up so I swapped in another one. The only change was that it threw a code (p0502)...
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