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Technical Do you want to run a 12 Volt tachometer on 6 volt positive ground?

Discussion in 'The Hokey Ass Message Board' started by tubman, Jun 23, 2017.

  1. tubman
    Joined: May 16, 2007
    Posts: 4,124


    If your car truly has been changed to 12 volts, you do not need something like this. It is possible to retain the original coil in a 12 volt conversion , usually by adding something called a "ballast resistor". This brings all of the voltages in line for a 12 volt system, allowing a regular 12 volt tach to be wired up normally. This is assuming that your car has been wired up negative ground. The polarity is almost always changed from positive ground to negative ground when a vehicle is converted to 12 volt operation, but you never know what might have happened in the past. Check your polarity first, and if you car is negative ground, you're good to go. If it's positive ground..... Well, get back to me and we can go from there.

    One last thing here; If your car all of a sudden starts to run badly, missing, etc. The first thing to suspect is the coil. Most people don't understand the current and resistance requirements to make the ignition work properly. If not set up just right, you'll end up with burned points and coil problems.

    You may not need my tach driver, but how's about one of my severe duty "Trash Can" condensers? They not only work great they add a touch of panache' to your distributor.:)
    IMG_0977.JPG IMG_0827.JPG
    Last edited: Sep 25, 2017
  2. LeoH
    Joined: Nov 4, 2011
    Posts: 462

    from Reno, NV

    FWIW, one of those truck guys, with straight cut gears and non-synchro trans who would be in your tach buyers market. 6V positive ground. We'll see where I need to go after I get my truck on the road, but I am curious. I am also waiting for the cheaper alternative unit that was allegedly built.
  3. tubman
    Joined: May 16, 2007
    Posts: 4,124


    "LeoH", Tell you what; why don't you PM Mr. "d2_willys" and ask him of you can purchase one of his units and get back to me.

    If you are interested, I still have 1 unit left from my original production run. I plan on making more this fall. I have been busy and haven't had time to push this product.
  4. tubman
    Joined: May 16, 2007
    Posts: 4,124


    Oh yeah, for the third time in over a year. Mr. "d2_willys", I'm still waiting.
  5. nrgwizard
    Joined: Aug 18, 2006
    Posts: 1,067

    from Minn. uSA

    Hey, Tubman;
    Just saw this thread. Did see your comment to me on other speed-parts/mfgrs thread. Thank you.
    Stude guys might buy, but most are "caso". (Cheap-assed Studebaker owners. Their term, not mine... :) ). There are a lot of guys into the hi-po stuff, they will pay a fair price for good stuff. Esp if it solves a problem, like say replacement for things NLA, + being easy to hide.
    Since Stude used S.W. gauges in 6v up to '55, n 12v 56 n later, & the tachs used the dizzy-electric-drive, will your box work in it's place? Also maybe I missed it, but will this allow a 6v pos-grd tach in a 12v neg-grd system?You mentioned in beginning of thread, that you didn't have one of these tachs? I can loan you at least one 6v n 12v, if you need them.
    There are at least 3 places to advertise in Studie land.

    Turning Wheels club mag
    Antique Studebaker Club club mag

    1st 2 would cost for ads, but product mention probably could be had for free, at least once.
    3rd guess no cost, don't know for sure.
    4th no charge
    5th pretty sure no cost.

    HTH. If you don't know anyone in the Stude clubs/forums, I might be able to help. It's just barely possible someone (vendor or dealer) might want to do a min volume order. I'm willing to make introductions, iffen you'd like.

    Also VW guys might be a good target for the tach-box, maybe the IH guys too.

    Since you posted on this thread, this is fair game:
    I & others would like to see what you do, & can do(Seriously). Start a thread, esp if you are willing to create helpful solutions. Although it sounds to me like tubman is giving you permission, *&* a dare - to post on his thread, your competing product, I encourage you to do so. (Enquiring minds *need* to know... :D ). Ryan himself opened a thread for this a couple of days ago. Competition 'twixt products doesn't *have* to be nasty. Different strokes for different folks. Lots have different needs/wants - there's lots of room. If you can build quality product for that low cost - I've got more than a couple ideas.
    Wish I had your knowledge/talent, it's not something I understand easily, to say the least.

    Last edited: Jul 22, 2018
  6. tubman
    Joined: May 16, 2007
    Posts: 4,124



    Thanks for your reply. First off, with the scarcity of 6V positive ground tachs and the universal availability of 12 volt negative ground units, it would be pointless to make such a converter. I am absolutely sure that ours would NOT work in such a situation. I am sure such a thing could be made, but there would be absolutely no market for it. I have posted on the "General Studebaker-specific Forum" and the "P15-D24" Forum, which has resulted in ONE sale. From my experience, it is not "CASO" 's as you suggest, but "CAFP" 's (Cheap-assed Forum Posters). I have had lots of comments and feedback from the forums, which have resulted in a few sales (not enough to sustain my operation). However, once I started listing on eBay the sales of the condensers took off. Once I get that under control, I'm going to have another batch of Tach Driver units built and list them on eBay. I have recently set up a web site hawking these units as well.

    As to "d2_willys" (and a few others); they come on here and piss on my breakfast with unfounded and unrealistic claims. Then they disappear to never be seen again. I have a good product for which I think there is a genuine need out there, but these characters have sowed enough doubt (especially about pricing) to have a dampening effect on my market. If you want an example, check out "LeoH" 's post about three back. I never expect to see anything from "d2_willys" about this because what he says he can do is impossible I know because I have done it and know what is involved.
    54vicky likes this.
  7. TrailerTrashToo
    Joined: Jun 20, 2018
    Posts: 334


    "CAFP" 's (Cheap-assed Forum Posers) ;)
  8. 54vicky
    Joined: Dec 13, 2011
    Posts: 1,037


    do not worry about them after reading about their abilities Elon called them to work with him.the new upgrades should be released shortly at least that is what he is telling his investors:D:Dor it was them telling him
  9. Budget36
    Joined: Nov 29, 2014
    Posts: 2,107


    Maybe we can bet him back in here?


    I'd like to see what he came up with.
  10. tubman
    Joined: May 16, 2007
    Posts: 4,124


    I don't think you'll see him. Getting something to run is just the beginning. After we had our prototype working, we had some problems with voltage spikes and other transient electrical anomalies that wiped out the board and even one of the 12 volt tachs. We had to add a whole additional layer of electronics to deal with these. If you are going to make one of these, it has to be able to operate under the adverse conditions caused by generators and solid core plug wires. The so-called "Pertronix problem" that many 6 volt users have encountered reared it's ugly head several times in the development process.
    Last edited: Aug 4, 2018
  11. tubman
    Joined: May 16, 2007
    Posts: 4,124


    It's been almost a year! I am doing all right with my tachometer drivers, as there a lot of reasonable people out there. I am wondering about how "d2-Willys" is doing with his project? I really hate poseurs!"

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