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Old 06-07-2012, 09:07 AM   #1
ARoss's Avatar
City: Chocowinity NC
Vessel Name: My Yuki
Vessel Model: 1973 Marine Trader 34
Join Date: Nov 2007
Posts: 615
Wacky Tach

We were running back from Ocracoke the other day, cruising @ about 7 kts, 1950 rpm, when without any change in the throttle or engine pitch the tach on the upper helm jumped up to ~2400 rpm, and stayed there. A quick check of the lower helm show it was still reading 1950-2000 rpm.

Any ideas where I might start looking for a reason this might have happened?

FL 120, single.

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Old 06-07-2012, 09:18 AM   #2
skipperdude's Avatar
City: Whittier AK
Country: USA
Vessel Name: Apache II
Vessel Model: 1974 Donald Jones
Join Date: Oct 2007
Posts: 3,147
I would first check the connections.
Is it the same sender for both tacs?
Is the tac run off the alternator or engine?


If you can't repair it maybe it shouldn't be on the boat
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Old 06-07-2012, 02:23 PM   #3
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City: Upstate,SC
Country: USA
Vessel Name: The Caroliner
Vessel Model: Plans to build 30' Spira Sitka
Join Date: May 2012
Posts: 1,005
Yep.We need to know what drives the tach.Then we can get down to diagnostics.
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