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  1. #1

    Join Date
    Feb 2007
    N. DE/OCMD

    Hot Tach III - hook up ?

    Have one without the instructions.... anyone know what the blue wire goes to? I'm thinking ground/switch but want to make sure....

    Unit has:
    Yellow - Tach (goes to plug wire)
    Red - Positive
    Black - Ground
    Blue - Switch (ground or positive though?)

  2. #2
    cbrich's Avatar
    Join Date
    Nov 2006
    Around Lake Travis
    Here is the manual for the Hot Tach III

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