I have a 60hp yamaha 2-stroke from 1998. It has digital tachometer that always have worked fine until yesterday when I put the boat into water again after the winter season. Then the tachometer shows as the picture below shows. Instead of showing rpm it says "F" and the trim indication shows one upper and one lower indication always. What can be wrong?! I live in sweden and spareparts for yamaha is extremely expensive :grumpy: