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Tach reading 500 rpm under

Discussion in 'Gen 2 Prius Accessories & Modifications' started by j12, Aug 28, 2014.

  1. j12

    j12 Junior Member

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    I installed an analog tach in my 2005 prius and it is reading 500 rpm under compared to the obd2 rpm i'm getting off of the torque app. I followed http://techno-fandom.org/~hobbit/cars/tachack/ this guide for the tach installation. Does anybody know why it would be reading pretty much exactly 500 rpm under?
     
    #1 j12, Aug 28, 2014
  2. 69shovlhed

    69shovlhed Surly tree hugger

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    not properly calibrated? what brand is it?
     
    #2 69shovlhed, Aug 28, 2014
  3. Britprius

    Britprius Senior Member

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    Is the tach set for a 6 cylinder engine.

    John (Britprius)
     
    #3 Britprius, Aug 29, 2014
  4. j12

    j12 Junior Member

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    #4 j12, Aug 29, 2014
  5. xliderider

    xliderider Senior Member

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    $13? You're lucky it's even THAT accurate. ;)

    Get a Scangauge/E or Ultragauge.

    SCH-I535
     
    #5 xliderider, Aug 29, 2014
    krmcg likes this.
  6. 69shovlhed

    69shovlhed Surly tree hugger

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    cheap no name gauges tend to be very inaccurate until they fail completely in a short time. autometer or vdo would be good choices, but you should go with digital.
     
    #6 69shovlhed, Aug 29, 2014
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