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  1. J

    Tach and 4-in-1 Gauges not Working - Digital is Fine

    I can start both Cummins QSM-11's and I get a readout from my Cummins ED-4 C-Command digital gauges. But my tachs and 4-in-1's have no readout at all. Needles don't move. Any ideas?? Thanks, Jeff
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