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Gauges
Posted: Mon Sep 12, 2016 11:56 am
by Grimmjag2
I have a 400 rpm difference between my starboard and port tach. How do I check or repair my tach?
Re: Gauges
Posted: Mon Sep 12, 2016 7:35 pm
by javalin390
Well, you need to ask yourself a few questions first, which will require a handheld tach. Are both engines actually running at the same speed when you observe the 400 rpm difference? Does this difference occur at idle, or cruising speed? Is one tach behaving erratically (needle bouncing)? A simple hand held tune up tach should be able to be purchased at a local auto parts store.
Re: Gauges
Posted: Wed Sep 14, 2016 6:45 am
by Fastjeff
Auto Zone may be able to lend you one.
Jeff
Re: Gauges
Posted: Fri Sep 16, 2016 10:11 pm
by martindesign
Most Automotive dvom's have a tach setting.
Re: Gauges
Posted: Tue Sep 20, 2016 11:38 am
by yooper
You can adjust the tachs with a tiny screw driver. A cheap test tachometer can be had for under $20. Mine will only read to 2500 rpm. Get one of the newer cordless optical/laser models with some extra reflective strips from Amazon. If the 400 rpm difference is constant you should be able to adjust the tachs.