Odometer replacement

Discussion in 'Gen 1 & 2 - Electronics & Audio' started by MondoSho, Oct 16, 2016.

  1. MondoSho

    MondoSho SHO Member

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    Anyone have a link? I just got a new cluster because my rpm gauge was not working.
     
  2. mrecoolgar

    mrecoolgar SHO NUP

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    Could be a failing cam sensor and not the gage.
     
  3. MondoSho

    MondoSho SHO Member

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    all I know was that there was a mechanical buzzing sound coming from the odometer, bu tit doesn't make the noise anymore.
     
  4. Irish Pride

    Irish Pride Irish Inside Staff Member

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    The mechanical buzzing is from the speedometer failing. I've had 2 do that to me. You will need to remove the clear cover on the front of both clusters and then the gauges just pop out. No screw holding them in. Once you have the speedo gauge out you will need to remove the needle. The easiest way is to take the 3 screws out of the back first and then use the two halfs of the assembly to pop the needle off. Once the needle is off and you have the two halfs apart then all you do is pry the odometer out of the old one and pop it into the new one. It's held in place by 2 plastic tabs. Use pliars on one end to pop it out and the other end will come right out too.
    The hard part about putting it back together is getting the needle set at the correct speed. What I do is put the speedo gauge back together and reinstall into the cluster but I leave the needle off and I leave the clear cover off. I reinstall the cluster into the dash but I leave the dash bezel off. Take the car for a drive and use GPS so that you have an accurate speed. I have a few speedo apps on my phone that I've downloaded. I get on the interstate and set the cruise and when I'm at a steady pace I'll put the needle in place but not all the way on. I'll wait to verify that the needle is accurate at several different speeds before I give it one final tap into place. After that, reinstall the clear cover and put the dash back together and you are done.
     
  5. rubydist

    rubydist Moderator Staff Member

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    or you could just replace the cluster with one that works...
     
  6. Irish Pride

    Irish Pride Irish Inside Staff Member

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    I think he wants to keep the mileage accurate to the car...
     
  7. rubydist

    rubydist Moderator Staff Member

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    its not hard to adjust the mileage on another cluster, without pulling the speedo needle off.
     
  8. MondoSho

    MondoSho SHO Member

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    It is! Please tell me more
     
  9. rubydist

    rubydist Moderator Staff Member

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    OK, I found that I had a Gen1 speedo left over from my parts collection, so I took it apart and took some photos. The Gen2 is different in details but identical in concept.

    DISCLAIMER: It is a federal felony to roll back odometers. This description is only to show you how to set the mileage of a "new" cluster to match the existing vehicle mileage. Please don't be stupid...

    Here is the cluster I have:

    [​IMG]


    When you take it apart (remove clear cover, remove screws holding the front face to the case) and turn it over you see this:

    [​IMG]

    Note the fingers are pointing to a shaft holding 5 (or 6 if you have 6-digit odo) little gears. These gears must be disengaged from the odometer wheels in order for you to turn the odometer wheels to the necessary setting. The gears are on that little pin (shaft) which in this case is held in by a knurl on the shaft near the right finger. Some other odometers have this shaft snapped into place. You need to get that pin loose so you can lift the little white gears off the odometer wheels. I did this by using a slip-joint pliers to push on the pointed end of the shaft while holding the right bracket. Then it looks like this:

    [​IMG]


    Now you can turn the odometer wheels to the correct positions.

    [​IMG]

    It is imperative that you get the little white gears back together correctly. This will take you a few tries. You will notice that the gears have alternating short teeth and long teeth. (Look at the left side of the little white gears in the picture.) The way it works is the short part of the tooth engages every tooth on the odometer wheel to the right of the white gear, and the odometer wheel on the left side of the little white gear only has one tooth slot, so that once per revolution of the odometer wheel to the left of the little white gear it indexes the odometer wheel to the right of the little white gear one set of teeth (one position). You have to get these all back in the right way for it to work...

    Here is my "new" Gen 1 cluster:

    [​IMG]

    Hope that helps!
     
    glockcoma, sperold and SHOdded like this.
  10. SHOdded

    SHOdded SHO Member

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    Wow, cool stuff right there :thumb:
     

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