Tachometer not working

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  • MrMcTavish
    • Jan 2026

    #1

    Tachometer not working

    A couple weeks ago, I pulled off the broken glass cover on the gauges to replace it with plexilglass. While I was doing that, I cleaned the face of the guagues and moved some of the needles while doing that. After I was all done I put the cover back on and started it up and the tach was sluggish and didnt read the exact rpm. I realize that I could have screwed up the calibration or something of the needle, and was wondering if I was completely screwed, or if i could fix it. Any advice on this would be helpful.
  • Nessism
    Forum LongTimer
    GSResource Superstar
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    Super Site Supporter
    • Mar 2006
    • 35787
    • Torrance, CA

    #2
    The amount of spring preload makes a difference in the accuracy of the gauge. Sounds like you have too much preload. I'd pull the gauge apart again and try again with the needle replacement.
    Ed

    To measure is to know.

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    • rustybronco
      Forum LongTimer
      Bard Award Winner
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      • Jul 2005
      • 14961
      • Marysville, Michigan

      #3
      What bike are you speaking of and did the tach work while the glass was broken?
      De-stinking Penelope http://thegsresources.com/_forum/sho...d.php?t=179245

      http://www.thegsresources.com/_forum...35#post1625535

      Comment

      • MrMcTavish

        #4
        Originally posted by rustybronco
        What bike are you speaking of and did the tach work while the glass was broken?
        Yes, before i pulled the glass off and replaced it, the needle worked flawlessly. Im thinking that with me cleaning the face of the gauges, I was moving the needles to clean underneath them and i think that moving the needles while it was off screwed something up. My friend told me that while he had his mustang gauges out, so i just assumed that it was no different on my bike. I did not remove the needles when i had it apart because I heard that then you have to re calibrate it and I didn't want to do that. Looks like that might be the only option at this point.

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        • rustybronco
          Forum LongTimer
          Bard Award Winner
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          • Jul 2005
          • 14961
          • Marysville, Michigan

          #5
          And the answer to the first question is?
          De-stinking Penelope http://thegsresources.com/_forum/sho...d.php?t=179245

          http://www.thegsresources.com/_forum...35#post1625535

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          • MrMcTavish

            #6
            Originally posted by rustybronco
            And the answer to the first question is?
            oh my bad. It's a 1985 gs700e

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            • MrMcTavish

              #7
              Bump please

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              • rustybronco
                Forum LongTimer
                Bard Award Winner
                GSResource Superstar
                Past Site Supporter
                • Jul 2005
                • 14961
                • Marysville, Michigan

                #8
                Originally posted by Nessism
                The amount of spring preload makes a difference in the accuracy of the gauge. Sounds like you have too much preload. I'd pull the gauge apart again and try again with the needle replacement.
                This is pretty much the answer to your problem; pop the needle off and try a different position.
                When you get the tach so it's reading correctly, crimp the lens back on.
                De-stinking Penelope http://thegsresources.com/_forum/sho...d.php?t=179245

                http://www.thegsresources.com/_forum...35#post1625535

                Comment

                • MrMcTavish

                  #9
                  Originally posted by rustybronco
                  This is pretty much the answer to your problem; pop the needle off and try a different position.
                  When you get the tach so it's reading correctly, crimp the lens back on.
                  ok thanks, I'll try that

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