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Thread: Tach is off by 30% on L29 0411 PCM setup

  1. 02-07-2023 #1
    brusk001
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    Tach is off by 30% on L29 0411 PCM setup

    Any fix for this? I finally got my 99 L29 7.4 with 411 PCM setup running good and noticed that at idle the tach is about 300 RPM or so off but on the highway it's way off like 1k maybe more as I wasn't logging when I noticed it. But I'm pretty sure my truck wasn't taching 4 grand in overdrive at 65MPH. Researching I've seen others with LS swaps either running dakota digital converter and found somebody talking about changing some setting from 4/4 to 3/3 and fixed his but there wasn't any details that I could find.
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  2. 02-07-2023 #2
    TheMechanic
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    Engine>General>Tach Output> set resolution high & low to "3"
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