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Tachometer Testing

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Hi Everyone!

I have a fairly simple question. How would I go about testing the tachometer on my 1976 MGB? Since I have owned the car, it has not worked. I've looked at the wiring diagram, and it appears to be hooked up correctly. Any advice would be welcome. Thanks!

-Matt
 
Maybe it helps to specify which type you have since there are quite some differences between the different systems out there.
 
It's a Smith's tach, electronic. I think it's the original tachometer from 1976. I've heard that for a mechanical tachometer, you can use an electric drill to test it. I was just wondering if there is a similar type of test for an electrial tachometer.
 
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