The abs sensors were detecting different speeds on either side of the car and that was causing your ABS light to turn on. Can't comment on the tach.
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Regards
Warren
Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor
Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL
ENTER > = (HP RPN)
Not part of the in-crowd since 1952.
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