Help fixing bouncing tach

gazkid

Cadet
Joined
May 14, 2012
Messages
6
Have a Volvo 3.0 GS Tach is steady up to about 3800 and then starts bouncing above that. What should I check first. I'm guessing it's not the tach unit itself seeing as its solid uo to 3800. Thanks!
 

biggziff

Seaman
Joined
Apr 15, 2012
Messages
54
Re: Help fixing bouncing tach

Have a Volvo 3.0 GS Tach is steady up to about 3800 and then starts bouncing above that. What should I check first. I'm guessing it's not the tach unit itself seeing as its solid uo to 3800. Thanks!

Mine was doing that until I made sure all the plug wires were not touching along their length. I bought some plug wire keepers at Napa for $3 which solved my problem.
 

gazkid

Cadet
Joined
May 14, 2012
Messages
6
Re: Help fixing bouncing tach

Thanks. I'll try that. Makes sense because the more I thought about it the more I'm convinced the tach was over reading the actual rpm and that the tach itself is ok.
 

biggziff

Seaman
Joined
Apr 15, 2012
Messages
54
Re: Help fixing bouncing tach

Also...if your tach is reading too high just give it a few smacks...I read that trick here and it worked great for mine.
 
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