Mercury Thunderbolt tachometer calibrator?

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  • March 5, 2018 at 4:12 am #9345
    johnsonjalopy
    Participant

      Found this in a box of parts and can’t find any info about it. Collectible, rare, worthless, or worth holding on to? Any opinion or knowledge is appreciated, thanks!!

      March 5, 2018 at 4:34 pm #72023
      punchbug
      Participant

        It is of no value for a mechanic as the new instruments will do the calibration easier. Don’t know if it is rare. But I would be interested in it as it will go well with my other merc instuments like my thunderbolt engine analyzer and my merc-o-tronic. I don’t have that so I would buy it off you. What are you asking?

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