I need help on getting my spped odmeter to work again on my boat. I've cleaned out the hole on the front of the lower skag are and run a small wire as far back as I can get it in the hole and still can't get the thing to work...Any help please advise, too small of a thing to take to the shop to have fixed, would probably cost an arm and a leg to have it repaired due to labor charge, so help an ole retired soldier out...