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Thread: Msd 7530 no tach output

  1. #1
    Join Date
    May 2018

    Default Msd 7530 no tach output

    I bought a lightly used digital 7 7530 ignition box. I got everything wired up and programed and my tach is not working. I used the gray wire which is the tach output according to the directions and get nothing. Upon further investigation the box doesn't have a gray wire coming out of it to the harness. The wiring harness that plugs in does but the one out of the box doesn't. Did msd make these boxes with no tach output wire? If so is there another way to get my tach to work without it? Thanks.

  2. #2
    Join Date
    Jun 2009


    There is a male spade connector on the box that's the tach output


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