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I had an earlier version of one of those from the Princess that I got on sale for about the same price a couple of years ago. Not as nice as yours though. Weirdly I had to set it on 8 cylinders to get a proper reading. It died recently and I bought a 4" unit, again from PA on sale for $19.99. I was told by a mechanic at Tirecraft that one of the failure modes of the earlier tach shorted the coil lead, presumably to ground. It didn't kill the coil but the car wouldn't run.
Cheers,
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Barry -- 1967 122S 'Betty'
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