I just had to debounce another Metro VSS, this one is probably the noisiest thing I have seen. I used pentium0's method of the capacitor to ground and a 47k resistor to switched 12V. I didn't have a 56 but anything in that range will be fine.
Now it is rock steady all the way up to 70mph. So anyone needing to clean up their Metro VSS signal just go ahead and do this method it is the best way to get a clean signal.
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