I have had a similar "no display" issue with my engine hours LCD under my tach meter on a Hunter 36 2009, with a 3YM30 Yanmar engine. If you disassemble the display panel in the cockpit, and dry out the connections to the tach/engine hours display with a hair dryer, the hours display on the LCD. This is, however, a purely temporary fix up here in the Pacific Northwest. I have seen other threads here in the same issue. My Yanmar dealer says that the instrument is water resistant, but not waterproof. Nice distinction, but it doesn't help. Those of you who have installed replacements, how did you keep the same problem from re-occurring?