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Do you have an electronic speed signal out of the speedo? Often there will be a distance pulse stream supplied to the ECU even when there is a cable drive for the speedo. If you have such a signal available I would use that instead of an ABS signal. En error in the mechanical speedo would not likely show up in the electronic signal.
The ABS sensors are generally a variable reluctance sensor where the signal level drops off at lower speeds. It is possible to use such a signal but it takes additional circuitry and even then some distance pulses can be lost at very low speeds.
Mike
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