Smartcraft problem

2005 SR SD 300 Went down to start boat today, it started right up and purred like a kitten. My problem was noticed when I had an error on the Smartcraft display "no tach found" neither of other gauges work either for the RPM's or anything. I'll be back down at the boat in the morning to try and locate the problem which is out of nowhere. Could it be a low a bad battery? What can be the problem? Where do I start Any help would be great.
 

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