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Here is a vintage Auto Meter racing tach and Rev Control unit. I got this when I bought a bunch of parts from a local racer I know. I don't know if it functions but he claimed it did and he used it on one of his drag cars. Appears to be in very nice overall condition. I can take more pics as needed.
See pics and let me know if you have any questions. NOTE that the tach readings/numbers begin at 1000 rpm.