You've read through the troubleshooting tips on the old "SMITHS The
Care of Instruments" pamphlet on the Vintage British Cables site, yes?
I've found that a useful publication.
http://vintagebritishcables.com/The-Care-of-SMITHS-Instruments.php
On 5/3/15, Andrew Uprichard <auprichard@uprichard.net> wrote:
> I have just put 100 miles on my newly-restored '57 small-mouth and am
> working through the usual "teething" problems: leaks, oil pressure
> adjustment, electrical glitches, etc. One thing I cannot work out is that
> the needle on the tach swings about quite a bit: it's ok at steady rpm,
> but
> gear changes cause marked fluctuations.
>
>
>
> I had the gauge rebuilt by Nisonger and I have a new cable. Any thoughts
> why this should be so?
>
> Andrew
>
>
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