Alarm/water temp gauge not working

[tpbadgers10]

Had the 190 out on the river a lot this weekend. On the last day (4th of July) I was pulling my daughter and a friend on the tube and after about 3 minutes into the ride the alarm on the boat started going off. I instantly slowed her down to idle speed and checked everything out. Nothing seemed out of sort but the water temp gauge was on low instead of the high end. Everything else seemed fine. All oil levels were fine. So I gave it another try but the as soon as I hit around 2000 RPM's it sounded again. So I just coasted back to the Sandbar and spent the next few hrs. there. As long as I ran it under 1500 RPMS it ran well and no alarm, but that water temp gauge was still on low. So I don't know if a sensor is bad or the gauge just isn't working. My Speedometer doesn't work either. Also when I got to the Dock I noticed the check engine light was on. Just wondering if anyone has had similar problems. Its a 2013 with about 45 hrs. All fluids were replaced when I Winterized the boat. Put on about 15 hrs. this summer s far. I dropped it off at the dealership tonight so they can have a look at it. I will have a long talk with them tomorrow.