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My experience with sensors has been that sometimes it works, and sometimes if the signal wires go to too many places, it doesn't work.
For example, my VSS goes from my transmission to under the dash, where it branches to the ECU, EPS computer and dashboard. In line to the dash I have a converter that drops the frequency. I also tapped on that branch, but before the converter, for my aftermarket cruise control.
Recently I added a separate converter for the cruise control, to drop its frequency to a different range, and I found my reverse lockout and other speed-dependent triggers stopped working. I still had speed on the dash and EPS worked properly, but the ECU started seeing 0mph, until I disconnected this most recent device from the tree.
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