1989 Iroc. Trying to figure out why my tach reads way to high, almost double! I,ve tried the search but it takes me elsewhere??

I am looking for this post for 89 and earlier capasitor change, Help.

"As many of you guys know... barely anyone has a 90-92 gauge cluster with a tachometer that reads properly. They almost always read too high. There has been a multitude of posts regarding finding a solution or a fix for this, but to my knowledge, no solutions so far.

For those of you wondering about calibrating an 89 and earlier tach, Morley has an old post that outlines the repair, which is a simple capacitor change. "

I can't find this thread

 

It's below if you are still looking . Didn't work for me though.

https://www.thirdgen.org/forums/elec...ach-fixed.html

 

Same sorta problem on my 87 Z. But, mine reads 7000 all the time. Doesn't drop to zero, ever. I have no idea.