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Tach not reading

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 The tach has been replaced by the last owner and works fine at a idle but as soon as I give it gas the tach goes right to 7000 and stays there until I get it back to a idle.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 befor I start troubleshooting it.
 
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