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Thread: what tach res should i choose?

  1. 02-14-2019 #1
    maddogwillie
    maddogwillie is offline
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    what tach res should i choose?

    1999 gmt 400 truck had 7.4 4l80.now 2001 lm7 tach wont read anythging
    what settings do i need to setr for hi n low in the tune?


    thx
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  2. 02-21-2019 #2
    rellsauto
    rellsauto is offline
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    Have you tried 3?
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