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Message: <blockquote data-quote="Mike10" data-source="post: 58482" data-attributes="member: 5461">There is no calibrating for hours.  A dealer can change the number of hours displayed, but that is all that can be done with hours.  I would again check to see if you have the correct model selected.  The rpms are determined by the alternator connection.  I think this also applies to the hours.  If your alternator is not working right you will not get the correct rpm displayed.The fastest way to check is take your board to another machine and see if it works there.Though the EIC's are not perfect, there failure rate is quite low.  The only exception are the early boards that had silver trim lines around the instrument panel lights.  The newer boards have gold trim lines.  There are two types of silver trimmed boards.  Those that have failed and those that will fail.Many times the EIC or for that matter any computer on a machine is the first thing to blame and replace when there are other causes.  I would suspect that is what you found with your inquiries.By the way, if you had a gold trimmed EIC it could have been rebuilt.If you had a silver trimmed EIC, you got the wrong replacement panel, though the operation is the same.</blockquote>