Tamd31L-A Rev counter not working

KnotLoaded

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Joined
7 Jun 2019
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Hi all- first time poster
My port engine rev counter needle has stopped moving- power to rev counter ok and lcd screen flickering as normally does. Swapped cable to starboard rev counter and all operates ok so not engine fault
Any suggestions to cause or is rev counter knackered and needs replacing
If replacing with new how can I restore engine hours to new

Many thanks
 
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