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Technical Odometer question

Discussion in 'The Hokey Ass Message Board' started by 4211papas34, Feb 9, 2025 at 9:39 AM.

  1. 4211papas34
    Joined: Jan 4, 2011
    Posts: 27

    4211papas34
    Member
    from chicago

    This question doesn't really fit into the form I apologize but there's a lot of car guys here that are pretty Sharp and this form gets a lot of traffic

    Furthermore I have been searching online for about a week and even posted on a different form for Grand Nationals and never got a response

    I have never seen an odometer like this I recently purchased a Grand National And the odometer only reads four digits The car seems to be A pretty original car it looks like this could be Factory I'm just curious has anyone ever seen an odometer that only reads four digits

    Again thanks for any input
     

    Attached Files:

  2. goldmountain
    Joined: Jun 12, 2016
    Posts: 4,715

    goldmountain

  3. dwollam
    Joined: Oct 22, 2012
    Posts: 2,546

    dwollam
    Member

    Resettable trip odometer. The tenth's are on that for the other actual odometer.

    Dave
     
    lothiandon1940 likes this.
  4. vtx1800
    Joined: Oct 4, 2009
    Posts: 1,814

    vtx1800
    ALLIANCE MEMBER

    It appears that one is a trip meter but the other doesn't have enough digits to read 99,999 miles either. Good question, After finding another picture of the gauge set I wonder if the left odometer's "rightmost" digit should be black and not white??
    upload_2025-2-9_11-54-8.png
     
    Automotive Stud and Budget36 like this.
  5. vtx1800 beat me to it

    trip.jpg
     
  6. justpassinthru
    Joined: Jul 23, 2010
    Posts: 595

    justpassinthru
    Member

    Does the white digit read in 10ths or 1 mile, while driving?
    Maybe the odometer was replaced at some point, incorrectly with something else?
    All the GN cluster images I see, have 5 digits and the odometer only reads miles and not 10ths.

    Bill
     
    Last edited: Feb 9, 2025 at 1:03 PM
  7. 4211papas34
    Joined: Jan 4, 2011
    Posts: 27

    4211papas34
    Member
    from chicago

    It almost to me seems like it was either swapped out at some point or somebody goofed at the factory of course the car is 40 years old anything could have happened the past 40 years but it does look like a fairly original car I'm no expert but it doesn't look like the dash has ever been taken out
    It just strikes me as extremely unusual
     
  8. Beanscoot
    Joined: May 14, 2008
    Posts: 3,415

    Beanscoot
    Member

    That's got to be the worst tachometer I've ever seen.

    upload_2025-2-9_13-49-3.png
     
    lothiandon1940 likes this.
  9. leon bee
    Joined: Mar 15, 2017
    Posts: 965

    leon bee
    Member

    We're still gonna be curious if that digit counts miles or tenths. I was thinking that tach looked better than no tach.
     
  10. gene-koning
    Joined: Oct 28, 2016
    Posts: 4,744

    gene-koning
    Member

    Back then, most of the odometers only read to 99,999 miles. Many did not have a 1/10 mile digit if they had a trip odometer (the 4 digit one), because the 1/10 mile digit was usually on the trip odometer. Most trip odometers went to 999.9 miles before rolling over, or could be reset to 0 by turning the knob or pushing the reset button. I believe that was because most people used the trip odometer to track the miles between fuel fill ups and would figure fuel mileage off the trip odometer. Gas mileage was simply dividing the miles on the trip odometer by the number of gallons used, and presto, MPG.
    Those trip odometers were great, until they quit working.
     
    vtx1800 and lothiandon1940 like this.
  11. MAD MIKE
    Joined: Aug 1, 2009
    Posts: 855

    MAD MIKE
    Member
    from 94577

    Most likely a repaired odo.
    Primary wheels(mile on odo, tenth on trip) have an additional driven gear. Can't use any of the other wheels as a replacement on the roller.

    If the original gear was damaged/stripped a white tenth wheel may have only been available... or 'borrowed' from another cars tripometer.
     
  12. twenty8
    Joined: Apr 8, 2021
    Posts: 3,120

    twenty8
    Member

    Ahhh, but did you spot the excellent "turbo boost" function below it?
     
    lothiandon1940 likes this.
  13. Clydesdale
    Joined: Jun 22, 2021
    Posts: 296

    Clydesdale
    ALLIANCE MEMBER

    How has this lasted so long on here!

    This couldn't be any more off topic.
     
  14. Maybe OP forgot to mention it is going in his '31?o_O.

    Now, on topic?:p

    Ben
     
  15. gene-koning
    Joined: Oct 28, 2016
    Posts: 4,744

    gene-koning
    Member

    The shown instrument cluster is too modern to talk about here. Old car, old (or look to be old) gauges, nothing newer (or at least very few things newer) then what was available in 65 is allowed.
    I'm surprised this has not been moved to the off topic section already.
     
    Clydesdale likes this.

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