Where does the Tachometer get it's signal from?

2

2003monterey322

Cadet
Joined
Jul 8, 2011
Messages
11
My tachometer needle jumps around but the engine is running smoothly. Where does the Tach gets it's signal from? Any suggestions where to start looking to find this problem? Engine is a 5.7 GI-D. Thanks.
 
reddogg

reddogg

Petty Officer 1st Class
Joined
Jun 3, 2011
Messages
379
Re: Where does the Tachometer get it's signal from?

If this is an outboard, there are 2 windings on the stator one is for the tach, the other for everything else. Look in your manual and it should show you which one it is.

Red
 
M

Maclin

Admiral
Joined
May 27, 2007
Messages
6,761
Re: Where does the Tachometer get it's signal from?

Usually from the negative terminal on the ignition coil. On really late model stuff it comes from the engine contol computer.
 
G

Glastron175

Seaman
Joined
Mar 13, 2010
Messages
71
Re: Where does the Tachometer get it's signal from?

Mine was doing that too, and I found that the ground wire was not making real good contact (right on the terminal at the back of the tach).
 
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