Sticky Tach Needle

[70Dave]

Finally hooked my tach[factory] to the MSD box. MSD said I didn't need any adapter, but I think it reads a little high. Haven't borrowed another tach to check yet. My real problem is the needle on the tach appears to stick around 2300 RPM. Won't go past 2500 and is slow to come down. Looks like it won't rotate freely in that area of the gauge. Has anyone had this problem? Any ideas on cleaning the gauge mechanism? Thanks.

 

[Steve_Chin]

Early GM points tachs are notorious for not being accurate when triggered by an electronic ignition. A filter circuit will help that out.

When I put the Camaro tachometer into my Blazer, I didn't allow engough room between the lens and the needle and my tach needle was sticking. Check to see if your needle center is rubbing the IP lens.

 

[70Dave]

Thanks for the info. Checked accuracy and found stock tach reads 100 RPM high through entire range. Good enough for me. Am going to try a shot of WD-40 on needle and see what happens.