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Hmm. Your ECU is probably not getting a speed signal. The way that the signal works is that is starts at the speed sensor (which you replaced), goes to the cluster where it is converted from a sin wave to a square wave. At this point the newly converted signal is sent from the cluster to the ECU. I think there is a problem with this connection. My car is the same way, speedometer works, but I can't setup launch control because my ECU sees 0mph all the time. I would look up the wire on the ECU for speed signal input and try and trace it back to the cluster.
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