2012 230 wake boat - digital speedometer works sporadically

I bought a 2012 230 wake boat 1/20/13.So I bought a new battery for it this year an OPTIMA BLUE TOP. Ever since I installed it my digital speedometer and my standard one work sometimes. I can be riding along at half throttle and it registers 30mph and then look down again and it registers 0mph. What do you think might be the problem?

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