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  1. m-35tom

    A1R Warning about gauges

    In reality is it not in the allison trans ECU?
  2. m-35tom

    A1R Warning about gauges

    NO, I was just saying that the VOLTMETERS on the dash were databus. A voltmeter!! WHY. So I can calibrate the voltmeter with the scan tool maybe? But the idea of changing the speedo through the C7 engine ECU gets my attention since I am soon putting 3.07 diffs in and I have the CAT scan tool...
  3. m-35tom

    A1R Warning about gauges

    how do you know? do you have wiring for A1R?
  4. m-35tom

    A1R Warning about gauges

    In an A1R where does the signal come from?
  5. m-35tom

    A1R Warning about gauges

    Well some kind of data bus, the volt meters have microprocessors in them. To hard to just have a volt meter!!
  6. m-35tom

    A1R Warning about gauges

    If you have an A1R do not try to test the voltmeters on dash. They are not voltmeters, they are indicators driven by CAN data from a ECM or ECU. Do you know where that unit is located in the truck??
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