Managed to get this cheap on fleabay


[img]
Smiths Rev counter [/img]

but struggled to find out how to wire it up for coil/dizzy. Sussed it eventually but the web/google wasn't massively helpful. so here's the back


rev counter rear

A = connect to the -ve side of the coil (side that goes to distributor)
B = connect to the +ve side of the coil
C = ground

That works for me anyway

http://www.gomog.com/allmorgan/smithsclassic.html




[Edited on 14/6/16 by alfas]

Thanks alfas, yes I found that diagram, and lots of other similar ones, but it doesn't relate to whats on the back of the tacho, so I eventually worked it out by trial and error

Correct wiring is

A - points side of coil.
B - switched live
C - ground

Coil + is switched live, so you'll be ok.