Mike:
Starting with the cable is always a good idea, but if it is not doing the
trick then the instruments are probably the culprit.
Most of the time when the Tach, or the Speedo start to get "bouncy" it is
because the silicone dampening that the factory put in 35 years ago has
finally ran out. The only real way to get it to behave for good is to go
inside the instrument and refill the dampening cup. I know these gauges are
not exactly maintenance friendly because of there crimped on bezel assy (Yes,
it can be done) but, the good news is that it lasts for a good 20 years, so
you probably won't have to do it again in you lifetime.
A dampening fluid of about 100,000 centistokes works best.
Hope this helps
Jon
Huntington Beach, Ca
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