I've been down this path with LMF gauges and it can get very expensive with all the sensors to be T-Boned for trim, fuel, oil, WPSI. Also, if you have Humminbird electronics you'll either have to add a nmea2000 GPS puck to get speedo to display MPG/MPG functions correctly or get Acitsense NGW-1 bridge that allows NMEA0183 (Humminbird) data to handshake with NMEA2000 gauges. They are nice and they do work as advertise.

Command Link in my opinion is a bit more user friendly and doesn't require any work around for full functionality.