wtf is up with my tach

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  • Smatt90IS
    Advanced Member
    • May 2009
    • 151

    #1

    wtf is up with my tach

    okay i bought my 90 325is a year ago and the tach worked all the time then it died for a month or 2 then i was messing with my fuel pump and it started working perfect and today i unpluged the battery to change an alternator and the tach quit working again?
    the obc works so its not the fuse and its not the DME Because i have tried two i think its the batteries but im not sure LMK IF YOU HAVE ANY SUGESTIONS
  • Oversteer
    Member
    • Feb 2007
    • 67

    #2
    You might have a bad SI board or the batteries are hosed up. Any other gauges acting flaky?

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    • Smatt90IS
      Advanced Member
      • May 2009
      • 151

      #3
      yea gas guage wiggles like crazy!

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      • jlevie
        R3V OG
        • Nov 2006
        • 13530

        #4
        Replace the SI board. And while you have the cluster apart, re-flow solder on the pads where the gas and temp gages mount to the main PCB.
        The car makes it possible, but the driver makes it happen.
        Jim Levie, Huntsville, AL

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        • Smatt90IS
          Advanced Member
          • May 2009
          • 151

          #5
          cool bmwguy87 is gonna fix it

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