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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
If it is a digital speedo then check for power and ground at the gauge, if analog then it depends on if it is a digital sender or mechanical where it mounts to the transom and uses water pressure and connects via a tube that commonly fail. There are also gps speedo's and thus I would need to know what type it is, but the above info should help get you started. You know if it has power and ground but does not turn on that there is a problem with the gauge itself, and thus there is a little info to get you started until I hear back from you.
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