Newbie hereI.... have a 99' Glastron sx175 w/ volvo penta 43GL.. I have read several threads about tach problems and see that most of the cause is from a bad coil. My tach does not work at allSpeedo.... is okay but no tach. Now here comes a dumb questionWhere.... on the boat can I find this coil? Any other suggestions of what the problem might be? Thanks in advance for the responses.