Bill,
If this is typical of the early Smith's tachs, there is a plastic or nylon
"box" under the thumb screw that is for a loop of wire that is actually the
coil feed wire. The tach reads the pulses going to the distributor and
registers from these. There should also be a ground wire and a hot wire. If
your car is negetive ground and the tach is positive, it is likely not to
work. Look in your wiring diagram or one from any early 60's British car and
you will see how it is wired. The loop of wire going through the nylon block
has to be done in a proper way for the thing to work when hooked up to the
proper ground. Next time you go to a British car meet crawl under a dash and
you can see the wire loop. The later Smiths tachs simply went to a one wire
in wire out feet from the coil, but still had a ground a hot wire. I hope
this is some help, easier to see then exlain.
S. Stierman, 69 +8
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