I have Livorsi moster guages on my boat and once I get to 50 MPH on the speedo it quits moving, stays right at 50 untill I get under 50 and then it starts working again. I gps'd the boat at 65 so I know its not that. Any suggestions?

call todd at livorsi, get a repair #, send it back . they'll repair it for you and check to see its functioning properly.

good luck