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Technical Need help with an older Stewart Warner tach.

Discussion in 'The Hokey Ass Message Board' started by rusty rocket, Feb 10, 2020.

  1. rusty rocket
    Joined: Oct 30, 2011
    Posts: 3,973

    rusty rocket
    Member

    I bought this tach on fleabay about a year ago and now it’s time to hook it up.
    It was advertised as a 6 cylinder marine tach. So I thought it would be perfect for my single seat project running a Dodge flathead six.
    I stuck it in the dash and ran my wire from the coil to it, once I touched the bottom bolt on the backside of the tach it grounded the coil and the motor died. Is this a tach that needs the box to go with it? 346165A7-D43E-4F35-8257-01B0BB528C25.jpeg 92D98F3D-C79C-4E4D-903D-68E0D05394E1.jpeg 4D6C60EF-78CB-4D74-9E2B-053511462E4B.jpeg Any help would be appreciated.
     
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  2. tubman
    Joined: May 16, 2007
    Posts: 5,210

    tubman
    ALLIANCE MEMBER

    It looks to me like the longer bolts are for the power and ground, while the one at 11 o'clock might be the input from the coil. You really need more information. Do the polarity and voltage (6 or 12) match? Have you googled the numbers printed on the back (or maybe even the patent number)? If you're not sure of what you have, you are in danger of ruining something.

    One minute of "Googling" produced this : https://www.stewartwarner.com/product/tachometer-electrical-mechanical-pn-82162b/. Close, but probably no cigar. I would pay particular attention to the message : "For sending unit options, please see the Senders & Sensors" further down the page. section.
     
    Last edited: Feb 10, 2020
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  3. rusty rocket
    Joined: Oct 30, 2011
    Posts: 3,973

    rusty rocket
    Member

    Anyone else? I don't have anymore info on this tach than what's printed on the back.
     
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  4. neilswheels
    Joined: Aug 26, 2006
    Posts: 815

    neilswheels
    Member
    from England

    Not sure about this one, but a lot of older SW tachs need a signal box to run them. Try contacting sixty7gt500 on ebay, he sells alot of SW stuff, maybe able to help you and provide a box if its needed.
     
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  5. the oil soup
    Joined: May 19, 2013
    Posts: 180

    the oil soup
    Member
    from Tucson,AZ

    Send these guys a note and they will be able to help you. I have a flathead six and an old SW tach in my Dodge truck and it works fine, they also have great customer service. I believe the box under the hood determines the signal that the tach receives but is replaced by the TachMatch unit. https://www.technoversions.com/TachMatchHome.html
     
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  6. alchemy
    Joined: Sep 27, 2002
    Posts: 15,863

    alchemy
    Member

    What’s the model number on the back, 960 something? That would be needed to start the research.
     
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  7. rusty rocket
    Joined: Oct 30, 2011
    Posts: 3,973

    rusty rocket
    Member

    960R and then after that I have no idea.
     
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  8. Canuck
    Joined: Jan 4, 2002
    Posts: 1,047

    Canuck
    Member

    From 1968 SW Catalogue: upload_2020-2-10_21-13-16.png
    by 1978 these were no longer listed in SW catalogues.
     
    Last edited: Feb 10, 2020
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  9. I have a tach with a similar Chrysler face.

    I have wiring info for it.

    I am out of town until the weekend. Let me get info to you then.


    Phil
     
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  10. Mine is similar but not the same tech. 20200217_074221.jpeg 20200217_074252.jpeg

    Phil
     
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  11. @rusty rocket, please try to decipher the number on tach. It contains digits 60

    Phil
     
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  12. I saw a couple of these tachs on the auction site. The two long studs are to hold the u bracket to front mount tach on gauge panel.
    With only one other stud I don't know what to suggest. If it was self contained it would need switched 12 volts positive, ground, and coil negative. I'm not sure how it works with only one stud.

    Phil
     
  13. Is that a 960xxx number on tach?

    Phil
     
  14. rusty rocket
    Joined: Oct 30, 2011
    Posts: 3,973

    rusty rocket
    Member

    Don't really know the number. What you see in the first picture is as good as it gets.
     
  15. Found these on another thread DSC04624-2.jpeg DSC04629-2.jpeg DSC04626-2.jpeg

    Phil
     
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  16. rusty rocket
    Joined: Oct 30, 2011
    Posts: 3,973

    rusty rocket
    Member

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  17. Little info on 900 series senders 15851872878261252576639094216703.jpeg

    Phil
     
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  18. rusty rocket
    Joined: Oct 30, 2011
    Posts: 3,973

    rusty rocket
    Member

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  19. If this is the correct sender, each wire runs from sender to designated termination point.
    Top two terminal left to right
    Light on tach
    Stud on tach
    Bottom three terminals left to right
    Switched 12 volts positive
    Ground
    Negative terminal on coil DSC04629-2.jpeg

    Phil
     
  20. rusty rocket
    Joined: Oct 30, 2011
    Posts: 3,973

    rusty rocket
    Member

    That seems easy but at $300 plus dollars I would like to know if this is really the part that goes with my tach.
    Was hoping a Stewart Warner guru would chime in when I started this thread.
     
  21. Sorry, I am not a SW guru. Just a web searcher.

    Maybe one of the instrument rebuilders could convert your tach head to operate without a sender box. Might be cheaper than as sender?

    Phil
     
  22. rusty rocket
    Joined: Oct 30, 2011
    Posts: 3,973

    rusty rocket
    Member

    I was looking at the classifieds here on the hamb and there was a tach very similar to mine. I contact the seller about some info but didn't get a response. Just thought I'd bump this up and see if anyone knows how to wire this thing up. image.jpg image.jpg
     
  23. Dang....how did I miss this one.....think I have the same in the dash panel with wiring....not sure it's the same unit....pics later.
     
  24. Maybe no help... 20200421_081330.jpg 20200421_081344.jpg 20200421_081408.jpg
     
  25. Will get a better picture of the model - think it was maybe 126 ?
     
  26. rusty rocket
    Joined: Oct 30, 2011
    Posts: 3,973

    rusty rocket
    Member

    Thanks man, so it looks like switched power. Ground and the third to coil.
    Do you know if it’s six or twelve volt.
     
  27. Yes 12 v the tach has SW 224 on it 20200421_150512.jpg 20200421_150459.jpg
     

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