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speed sensor will not affect the tach working. I think the wiring was not done right when the SR swap was done. Under the dash by the ECU there is a white plug that leads from the ecu, and plugs into the dash harness. Has that been converted? Is it pluged in? Are the Yellow/red stripe(tach signal) Yellow/green stripe (speed signal) connected?
PS. The JDM and USDM speed sensors are the same no need to swap them
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