Check the pin connectors behind the dial could be a loose fitting if not then replace them.
Also if you have high hours on your opti check the alternator rubber mounts on the bracket as I have just replaced my bracket after having a bolt shear for the third time lucky to not lose the compressor as the belt was shredded.
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Tim Griffin
RYA Freelance YMI power Powerboat and PWC instructor trainer vhf first aid sea survival Diesel engine radar and navigation instructor
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