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He first shopuld try clearing the code, see if that fixes it or if it's still a current code. If it's still current it could be a bad electrical coupler (that's the part the harness attaches to the transmission with, but kinda doubtful on that. He can laso look in the actual value screen and compere front and rear rpms.
Other possiblity would involve removing the valve body again; he can remove the valve body and look at the small square "window" in the bottom of the case and make sure he can see the slotted sheetmetal bracket that surrounds the front cluster, they were originally pressed into place and can slip so the sensor can't "see" the slotted bracket any more and won't pick up the speed. The newer versions were spotwelded.
Gilly
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