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Technical What Speedometer for Hot Rod

Discussion in 'Traditional Hot Rods' started by qmdv, Aug 1, 2019.

  1. alchemy
    Joined: Sep 27, 2002
    Posts: 14,387

    alchemy
    ALLIANCE MEMBER

    Don't they make a mechanical version? Why introduce more electric stuff (sender) than needed. Henry drove his speedos with a cable. You should too.
     
    kidcampbell71 and 56shoebox like this.
  2. burl
    Joined: Nov 28, 2007
    Posts: 597

    burl
    Member
    from Minnesota

    Keep the old one and run a speedo app off your phone.I have a hall effect sender in one of mine and it does not work very well.Needed to re-teach the thing to much.Gave up and running a speedo app off my phone.
     
  3. My problem is that i do not have a speedometer. And I have a 3.27 to one in a 36 ford rear end and am not sure where I will end up as far a tire size. Finding the correct speedo drie is a challenge. Maybe I should work towards that though
     
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  4. 56shoebox
    Joined: Sep 14, 2011
    Posts: 1,106

    56shoebox

    Cool! Where do you download this speedo app? I would be interested in that.
     
  5. burl
    Joined: Nov 28, 2007
    Posts: 597

    burl
    Member
    from Minnesota

    If you have an iphone there are several in their app store.The one I have been using is the 55 app its free and has navigational functions as well.
     
  6. The phone app is starting to appeal to me
     
  7. lostone
    Joined: Oct 13, 2013
    Posts: 890

    lostone
    Member
    from kansas

    I've been looking for a speedo too. And I hate the 160 mph ones, really? How many cars need 160 speedo ?

    I want a 100 to 120 old oem one myself but I've been looking at the GPS new style but I may have to check out this app you gents are taking about.
     
  8. 49ratfink
    Joined: Feb 8, 2004
    Posts: 17,370

    49ratfink
    Member
    from California

    a flathead powered car will not run with new store bought gauges. it disrupts the space-time continueum
     
  9. Malcolm
    Joined: Feb 9, 2006
    Posts: 7,481

    Malcolm
    Member
    from Nebraska

    As far as the GPS based speedometer apps, I use the DigiHUD version on my Motorola Droid phone and it works well.
     
  10. jimmy six
    Joined: Mar 21, 2006
    Posts: 4,756

    jimmy six
    ALLIANCE MEMBER

    U can get an adapter to correct your stock feed from the transmission. I got mine from a instrument place in Texas... Highest gear for my car was a 3.21 and I put in 2.74's. the adapter brought it to perfect.
     
    Last edited: Aug 1, 2019
    46international likes this.
  11. You may be correct.
    some of my instruments are out of a totaled Peterbilt
     
  12. Texas is a very big state. Can you narrow that down a bit. Do you have a company name
     
  13. Cliff Ramsdell
    Joined: Dec 27, 2004
    Posts: 1,033

    Cliff Ramsdell
    Member

    I use an old truck gauge in my hot rod. It’s a 1-1 piece and just swapped Speedometer turtles till I got it honed in. I’m within an MPH at most places on the dial.

    Cliff Ramsdell
    5D81AB49-27A8-4971-94F7-BF5A71B6C369.jpeg
     
  14. dana barlow
    Joined: May 30, 2006
    Posts: 3,544

    dana barlow
    Member
    from Miami Fla.

    So over coming not having a way at the time, to hook up a speed-O in a 1928 "A" dash,to a 1957 Ford tranny on 1949 Olds rearend with 30in. high rear tires,,,Taking you back too how I know what speed I was going in 1959,got a Sun RPM Tach from J.C. Whitney. Made a 1/2in. wide ring alum ring to fit around out side of tach. With my buddy driving his reg car,I followed as he run first 10mph for a block and then 20 the next block an so on,up to 60. I marked the ring at the RPM at each speed in highgear.
    So that made the tach also in too a speed-O. Now days you young spuuuus have GPS on the cell phone to tell what speed an were your lost butt is going too. LOL
     
  15. Do you always drive with fuel cap off
     
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  16. jimmy six
    Joined: Mar 21, 2006
    Posts: 4,756

    jimmy six
    ALLIANCE MEMBER

    Texas Industrial Electric. In San Antonio.
     
  17. e1956v
    Joined: Sep 29, 2009
    Posts: 1,368

    e1956v
    Alliance Vendor

    I can take care of any calibration issues you would have with the speedometer.
    No problem to get it dialed in and can make up any cable you would need to get it up and running.
     
    Cliff Ramsdell and Inked Monkey like this.
  18. BrandonB
    Joined: Feb 24, 2006
    Posts: 2,989

    BrandonB
    ALLIANCE MEMBER
    from nor cal

    SW survey speedometer or something else a little different.
    I like how the second one is split between "driving range" and "danger zone."
    IMG_6519.jpg IMG_6520.jpg
     
  19. e1956v
    Joined: Sep 29, 2009
    Posts: 1,368

    e1956v
    Alliance Vendor

    How much room do you have?
    A 5-1/4 hole will give you a cool Studebaker speedometer that's 5-1/2 bezel size. Got one here if it will fit. 20190802_080945.jpeg

    Sent from my SAMSUNG-SM-G890A using The H.A.M.B. mobile app
     
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  20. sloppy jalopies
    Joined: Jun 29, 2015
    Posts: 3,107

    sloppy jalopies
    Member

    Don't know if it has been tried but there are a bunch of different bike speedometers...
    .
    Found a 4 5/8" speedo at the swapmeet… thought it was bike but looked and fit right...
    $5.00, sold ! …
    .
    Is there a "screw to the back of speedo" converter to let it adjust to work with cars ?
    .
    pix of it set in from the "back" in a modified '38 dash...
    it had the flange that also lets it mount from the front...
    ..... my $0.02...
    .
    DSCN3473.JPG DSCN3476.JPG
     
    46international likes this.
  21. Blues4U
    Joined: Oct 1, 2015
    Posts: 3,890

    Blues4U
    Member
    from So Cal

    "We don't need no stinkin' speedometer......"
     
  22. DDDenny
    Joined: Feb 6, 2015
    Posts: 12,349

    DDDenny
    Member
    from oregon

    Yeh, just use the one that the police car has that's in front of you.:p
     
    Blues4U likes this.
  23. fleetside66
    Joined: Nov 20, 2006
    Posts: 2,392

    fleetside66
    ALLIANCE MEMBER

    If you don't want a 160 mph job, how about this 65 mph 1915 REO Speedwagon unit? It worked for a 100 years & it's still working. And, it was made in the U.S. & doesn't need a sender....lol.
    IMG_3120.jpg
     
    shivasdad, BrandonB and e1956v like this.
  24. Harley speedo most likely aftermarket...you can get them new from Harley catalogs but they are 40-50 bucks.
    And they make two versions, one with a 1:1 ratio and another with 2:1.

    Just to brag a bit, I made a speedo drive gear from my lathe and milling machine, used a large screwdriver handle, works fine. I could not get the correct tooth count on a gear that would fit a '57 ford-o-matic trans so I had to make it.
     
  25. fleetside66
    Joined: Nov 20, 2006
    Posts: 2,392

    fleetside66
    ALLIANCE MEMBER

    Or, a 70 mph Federal? Works like butter! But on a serious note, it is always a crapshoot to get accuracy with any speedometer (barring non-traditional GPS stuff, etc.) with all of our crazy gearing & tire sizes.
    But, if you get a mechanical one & hook it up, you can quickly get an idea on where you're at in relative terms. I'm running an early 1950's S/W "Wings" 100 mph unit & I really never cared to much about a few MPH increments here or there. Ironically, every time I drive by one of those roadside gizmos that tells you how fast you're going, I find that my speedo is dead on. Go figure.

    IMG_3121.jpg
     
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  26. BrandonB
    Joined: Feb 24, 2006
    Posts: 2,989

    BrandonB
    ALLIANCE MEMBER
    from nor cal

    Or a vintage Harley speedo but those might be a little over done. 0BBC9425-4396-44BE-83AF-6B8DEDED49C4.jpeg I have an early 50’s speedo in the 34, been there since the late 60’s.
     
    waxhead likes this.

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