This tachometer is a reproduction of the original RSM 3003/13 3:1 drive ratio black-faced instrument.
This spare is applicable to BSA A50 and A65 models from 1970-1972.
Specific 3:1 drive ratio for BSA twins fitment. This reproduction gauge is 1/4″ taller than the original Smith’s tachometer.
The tachometer monitors engine speed and is driven by a cable.
The tachometer is mounted to a bracket on the top yoke of the fork, usually fitted into a rubber cup. Due to the extra height of the unit, it will protrude above the rubber cup when fitted.
Read our article: The Legacy of BSA Motorcycles from A10 To A65 Through A70
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