"As for the GMI 20, it is only a display. It displays the information that is sent to it via NMEA 2000 PGN's. The GMI 20 cannot alter
If the Garmin gauge is wired in correctly, then the problem is either that the 150's are throwing off an incorrect signal, or the GM 120 gauge is not
Carb or EFI motor???
[QUOTE=mastertec Tech Mercury;334630]These engine are call 2 plus 2.It only runs on top 2 carbs till around 1800 RPM's...These motors are one of the hards
Orange spark is no good from any ignition.
Spark should always be bright whitish blue...........