For those of you who are not part of the Centurion/Supreme Facebook page there has been discussion of '17 Supremes water temp display vanishing either after working for a bit or not working at all. Its my understanding that if you have a depth gauge then you should have a water temp gauge as well as it should be one unit. Mine was not working so I recently jammed up my Western Washington Dealer and he was able to get an updated software version from Supreme and it instantly brought back my water temp display after never having it for just shy of a year. I highly recommend at the minimum a phone call to your dealer to see whats up if your water temp crapped out on you or you never had one as a new to you boat.
**Disclaimer**
My boat is a '17 S238 but it is my understanding that this is good for all the '17s