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Jumpy tach

paulaspal

New member
At idle and up to 1500 rpm my

At idle and up to 1500 rpm my starboard tach jumps up and down several hundred rpms and continues to do so until I hit crusing revs of 3200. Port tach is fine. Any ideas as to why this is happening? Engines are Marine Power 454 EFI's
 
"Could be the tach itself or a

"Could be the tach itself or a bad connection. One way is to swap tachs, port<-> starboard. if the Jump Syndrome goes with the tach, replace it. otherwise, start checking/cleaning/reseating connections."
 
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