The best repair is to replace the old cable with a new one. Ford Bronco 1980-1986 L6 4.9L 300cid. Ford Bronco 1980-1986 V85.0L 302cid. Ford Bronco 1981-1986 V85.8L 351cid. Ford Mustang 1979-1984 L42.3L 140cid.
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Speedometer Cable - Ford Bronco 81-85, Mustang 65-68 Lincoln Continental 58-60,
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A new MK2 Ford Cortina Series 2 speedometer cable