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Tach not reading

J

justinf299

New member
I recently bought a Crestliner deckboat with a 125 mercury outboard on it... The tach has been replaced by the last owner and works fine at a idle but as soon as I give it gas the tach goes right to 7000 and stays there until I get it back to a idle. Anyone ever had this problem?? Trying to get some ideas before I start troubleshooting it.
 
Never had that problem, but most after market tachs have a setting on the back for number of cylinders. Check that your setting matches you number of cylinders. Also, go onto the manufacturers website and pull down the installation and set up instructions for that model and see if it is installed and set up correctly. If that is all in order, then you need to test the output pulses from the stator or ECM, depending on your type engine.
 
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