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Doesn't the speedo on those get its cue from the rear wheel speed sensor? (one of the top two, though I think the difference between them is one comes with a harness, and the other does not.)
The one on the trans is the output speed sensor. I don't think that is used for the speedo, or anything beyond shift points..... Should only be one rear wheel speed sensor. Right on top of the pig on the rear diff.