If either speed or odo works and keeps working then it is impossiblefor the VSS (signal generator) to be malfunctioning.
It's the same signal. The speedo measures the frequency of the signal. The odo measures the number of signals, regardless of the frequency.
The same number of signals equals the same distance (odo)
The same number of signals divided by the time it takes to generate them (speedo)
Plug in a different cluster and test before replacement without installing the cluster.
I would estimate the chances of a VSS replacement fixing your problem at below 1%.
regards
mech
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