Speedo cable / smiths box (% used)

[Robert.Haigney@anixter.com]

I have a question and I hope it's not too stupid, the cable that runs from
the transmission to my speedometer, passes through a smiths box, that is
labelled % used, and has the number 270 in it, what is this box.....????
What's it called what does it do...?? What's the 270 mean...?

Thanks.

Robert.
78 Spitfire

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