Well for starters, the signal is supposed to be a square wave rather than a sine. ABS sensors tend to be simple coil-and-magnet setups that read a notched ring that spins with the axle. The VSSs that others have been using are switch-type sensors or have internal driving electronics that output a clean square wave. Is there a VSS sensor somewhere that isn't a part of the ABS system?
If not, an op-amp could turn your sine into a nice square wave.
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