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On the 4th gen cars the VSS signal does not go directly to the speedometer. It is sent to the ECM. The Gauge is connected to the ECM which is where it gets the signal. The Signal from the VSS is a little different compared to the signal given from the ECM, I was told it is a little rough if the signal is taken directly from the VSS. The ECM is supposed to act as some type of buffer.
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