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  1. #1

    Default 85 to 140 face change question

    lets say you did the 140 overlay onto your 85 speedo,
    Could you calibrate the speedo by changing out the speedo gears in the transmission?
    like going from a 18 tooth to a 23 tooth for example? or 23 to 18

    Would that work? it would be a lot easier than getting the speedo recalibrated.
    Has anyone done it that way?

  2. #2
    FEP Supporter 4-barrel Mike's Avatar
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    Default

    $150 from ascMcLaren.com http://ascmclaren.com/interiorparts.htm

    Name:  speedo.jpg
Views: 195
Size:  78.1 KB

    Mike
    1985 ascMcLaren 5.0 SC Roadster
    My '78 Fairmont build - http://vb.foureyedpride.com/showthre...539-78-Big-Red

  3. #3

    Default

    You have two choices:

    1. re-calibrate the speedometer; OR
    2. use a 'ratio adapter'

    I don't know if #2 is even available for the Foxes.
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  4. #4

    Default

    Or you could buy a repainted one without having to worry about bubbles from the overlay.
    https://www.foxresto.com/Mustang-140...-p/3283004.htm

    Quote Originally Posted by 4-barrel Mike View Post
    $150 from ascMcLaren.com http://ascmclaren.com/interiorparts.htm

    Name:  speedo.jpg
Views: 195
Size:  78.1 KB

    Mike

  5. #5
    FEP Supporter 4-barrel Mike's Avatar
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    Default

    Hadn't seen those before.

    But $25 for the 2-minute job of changing the odometer reading?

    Mike
    1985 ascMcLaren 5.0 SC Roadster
    My '78 Fairmont build - http://vb.foureyedpride.com/showthre...539-78-Big-Red

  6. #6

    Default

    Don't have to pay it, do it yourself.


    Quote Originally Posted by 4-barrel Mike View Post
    Hadn't seen those before.

    But $25 for the 2-minute job of changing the odometer reading?

    Mike

  7. #7

    Default

    Lets say you even COULD mess with needle drive rate at the transmission and make it so ~105 on an 85 MPH calibrated needle with a 140 sticker under it reads somewhat close to 140. Now the odometer will be off vastly.

    If you do some searching you can also find a BBK speedometer that puts 170 at 3:00. Now you can go past 200 without worrying about twisting the cable off. Perfect for your 5 second 1/4 mile car or your standing mile car.

    Four eyed Saleens and worthy clones have this speedomter calibration with a Saleen 170 overlay.

  8. #8

    Default

    So if I get the ford version or the asc one it is plug in and accurate?

  9. #9
    FEP Supporter 4-barrel Mike's Avatar
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    Default

    Yes.

    Mike
    1985 ascMcLaren 5.0 SC Roadster
    My '78 Fairmont build - http://vb.foureyedpride.com/showthre...539-78-Big-Red

  10. #10

    Default

    FWIW, I have seen the Fox Resto speedos from development on. I live where they are. They are REALLY nice looking. Nobody would ever know it was not an OEM 140 speedo. It's a converted 85 MPH unit. That's why they want your old one back.

  11. #11

    Default

    Very cool

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