Smiths racing rev counter RN1104/02
4:1 ratio
12,000rpm, anticlockwise cable rotation
Tested on the bench and perfectly working. I can send a video of the tacho working.
Used mostly on 2 stroke race bikes such as Cotton , Greeves, Royal Enfield GP5 etc in the 1960s
Also used in Classic F3 & other race cars
I ship worldwide and am happy to a answer any question.