Just had my tach (70 gs ) repaired by board member Scott. 87gn_70gs Works great now and very responsive. Tip-of the day : use his service if you have a tach issue.
Yes, had Scott do my original tachometer and replace the mechanism with something more accurate. Very pleased. https://v8buick.com/index.php?threads/stock-tachometer-but-better.362092/