21 SSI 2020 with 4.3 Volvo stern drive 240 hp in Boat Talk Posted 15 hours ago 9 hours ago, Sandy Reinauer said: Suspect that NMEA2k gateway might be expensive...I'll try my engine analyzer first. If it is a tach error then I'll be taking it to my Chaparral dealer (in the spring). All winterized for now so no rush. Thanks Nope, cost was about 175. Plus a few cables.