I was about to ask about the tach, usually means stator. Do you have a volt gauge or voltage readout on your gps.
When they were replaced, was it with OEM or look-a-likes. I think the sierra switchboxes are ok, heard mixed reviews on the stators.
Also might want to get a merc manual and do a link.n.sync. Probably Will not help, but will eliminate some things.
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