Gauges
Gauges
I have a 400 rpm difference between my starboard and port tach. How do I check or repair my tach?
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javalin390
- Royal Aluminum Star
- Posts: 409
- Joined: Sat Jan 10, 2015 7:14 pm
Re: Gauges
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.
Jim Elias
1974 37' SedanFlybridge
Twin 360 Chryslers.
Marblehead, Ohio
1974 37' SedanFlybridge
Twin 360 Chryslers.
Marblehead, Ohio
Re: Gauges
Auto Zone may be able to lend you one.
Jeff
Jeff
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington
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martindesign
- Aluminum Star
- Posts: 104
- Joined: Sun Mar 29, 2015 2:07 pm
Re: Gauges
Most Automotive dvom's have a tach setting.
Machanic, fabricator, carpenter, plumber, electrician, designer, hotrod builder and glutton for punishment. 
current boat; 1969 Marinette 32 express bridge 440's
Catawba Oh
current boat; 1969 Marinette 32 express bridge 440's Catawba Oh
Re: Gauges
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.