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I'm getting a loud screeching noise from behind my instrumet panel and my tach went haywire. I believe the cable is toast. How difficult are they to change?
However, while you've got it apart, check the cable. It is cheap insurance to lube and/or replace the cable at the same time. Also, some 68s eat cable drive gears for lunch (the tach drive in the distributer). My 68 427 used to chew up a gear about every year. However, it is very unlikely that you have this problem causing the noise.