Erratic tach readings

R

redoakwood

Recruit
Joined
May 16, 2010
Messages
2
I have a 88 Larson 21' Sportcruiser w/ 4.3 omc cobra purchased last year. Tach started reading up to 1000 RPM fast. Sometimes reads true, sometimes fast. Is this a ground problem or do I need to replace tach?
 
R

robert graham

Admiral
Joined
Apr 16, 2009
Messages
6,908
Re: Erratic tach readings

I'd check/clean/tighten all wires and connections, then if that doesn't fix it get a new tach. It's probably just a loose or corroded connection, so much moisture/humidity/vibration in a boat.
 
B

bnicov

Petty Officer 1st Class
Joined
May 25, 2009
Messages
348
Re: Erratic tach readings

Tap on the lens of the tach when it is reading inaccurately. If it drops or goes up then chances are it is toast. Check the manufacturers website to see if you have a lifetime warranty on your tach. I had the same sort of issue and Faria sent me a new one for $40.
 
R

redoakwood

Recruit
Joined
May 16, 2010
Messages
2
Re: Erratic tach readings

Thanks for the tip, bnicov. I have tapped and sometimes it returns to a reasonable rpm and sometimes not. I will check all grounds and get info on tach maker for probable replacement. With all the lousy weather we have been having on Lake Erie, I might as well sit at the dock and play with the boat.
 
You must log in or register to reply here.
Top