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Fluctuating Rev Counter Needle

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The rev counter on my TR3a has up to now been pretty stable but recently it has started to waver about before settling at what i presume is the correct reading.

Can anyone advise what is likely to be the cause?

Rgds Ian

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Never grease rev counter or speedo cables as it can work its way up into the head unit, better to use graphite powder. https://www.ebay.co.uk/itm/C-K-Graphite-Powder-Lock-Lubricant-Cylinder-Car-Padlock-K30050-50g/142957414356?hash=item2148ed07d4:g:j5oAAOxyuPtQ-AOs


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+1 for graphite powder, by far the best to lubricate locks also. Great surface slip agent and non sticky so will not attract dust and muck eventually gunging things up.


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