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Tachometer reading off

A

ArtK

New member
Yesterday while fishing all of a sudden when starting my 90hp mercury on my 1995 Tracker Pro 18 the tach. started to read 4000 as zero and pinned the needle at 6500 plus at WOT instead of the normal 0 to 4500 ish. Any thoughts would be helpful Thank You Art
 
If you didn't play with the pole selection switch on the back of the tach. I would say you tach is done and needs replacing. If you tap the bezel of the gauge while the problem arises. Does the need sweep erratic. Or sweep to normal working order ?
 
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