I was told that you set the PCM with your vin # so that the communication
link between the PCM and the other computer under the dash can be
established. It also allows for a check of any trouble codes so then they can
be cleared. It doesn't change the speedometer.
Jim Colson
Lawrence, Kansas
99 R/T Black CC
Mopar Performance: PCM, 7.5mm wires, Headers, Aluminum valve covers; & K&N
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