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Vintage AC Tachometer?


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Can anyone tell me what this little AC Tachometer is for? 3 inches in length...1 1/2 inches in diameter.....when the input shaft is turned clockwise the tach measures RPM  in increments of  a 100 from 500 to 4000 rpm.....when the shaft it turned counter-clockwise is measures RPM in the same increments from 500-4000RPM?    Thanks for any help.....




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