Yes, in 30,000 miles on my ’95 SS-SP, I am on my second tach cable, and third speedo cable. I don’t know if it’s the routing, heat, or just crappy cable construction, but they don’t seem to last long. I am guessing your problem is likely the cable. If you get a new cable I would suggest that you wash out the factory graphite (or whatever they use) and use an aftermarket cable lube or light motor oil. I’ve been using synthetic 10W30 in my latest speedo cable for a few years now. Fingers crossed.
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