I'm not sure what year your tranny is, but mine is an 88 and had the electronic speed sensor instead of a cable, so I purchased a speedo gear kit from Bowtie Overdrives
http://www.bowtieoverdrives.com/cata....php?ITEMID=14
It worked on my 66 but my needle is broke on my speedo... I'm not sure if the cables are the same as a 60 but maybe that helps some...
Tony
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