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The longer non cruise cable will work, easy enough. Easier, try a lower cable for 86-88 SS Monte Carlo which may work by connecting directly to the upper cable.
not to hijack this thread , but i noticed on the bloomington road tour my speedo was reading like 25 when i was doing way more then jumped up to what i was really doing,,new 2 piece cable,(new trans for that matter everythings new) also when i installed the cable i also bought the cable lube and coated the 2 cables good before i assembled them,,,just started doing this,,, dirty needle on the guage???
That would normally be the transducer going out w/ 2 cables. With one cable, then the cable. It can also happen after the cable has taken a set & someone moves it, moving back can fix.