tach gauge warning symbol ?

[eric.101]

Hello I have recently installed an 04 200hp hpdi and digital tach that came with it on my boat. I am getting a warning indicator that flashes above the rpm indicator and I'm not sure what it means. It shows what looks like fluid coming in on both sides and dripping down in the center and only flashes at slow speeds. Could someone tell me what this symbol stands for and what would cause it to apear. The motor seems to run fine and there are no alarms going off. Thanks for the help. Eric

[boats.net]

Could be water in fuel warning, check fuel filter on engine to see if water in it.