Demonstrated at the Miami Boat Show, and scheduled to ship this Fall, Yanmar’s Smart Check looks like a gem of an engine monitoring system. You will need to have one or more Yanmar diesels with electronic interfaces and a NMEA 2000 connection to a Raymarine E-120, plus about $800 for the software (loaded into the E from a CF card), but, wow, you even get detailed alarms with trouble-shooting suggestions, and a maintenance log with reminders. And of course the gauges are...