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  1. #1
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    Question Tacho signal from alternative source

    Can automatic transmission input speed sensor on a electronicly
    controlled transmission be used for tachometer/rev-counter signal?

    The reason I ask is on my engine swap the doner car's gauges all
    went on a bus system and not separate wires.
    The car the engine is going into has the wiring for separate gauges.
    The speed sensor is coming off a sensor on the adapter part for the
    transmission an will give the correct speed of the car.

    But the rev-counter signal where to connect to get a good correct
    signal! Someone suggested tapping into the input speed sensor on the
    transmission.

    The doner Vehicle was a 1998 Chrysler Voyager/Dodge Caravan v6 engine
    and a 4 speed automatic transmission (41te)

    Any help or suggestions welcome, and thank you in advance.
    Last edited by Mitsuru; 11-17-2011 at 09:27 PM. Reason: title
    I'm diabetic,I'm disabled BUT I'm not dead yet!!!
    The ONLY Right Hand Drive Neon with 3.3L v6 Engine & 41TE ATX SWAP






  2. #2
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    There are a few different web sites with DIY versions oF the tach adapter.


    Tachometer Installation

    http://vstar1300.pbworks.com/f/TachAdapter.pdf

    I have found after a little research a cheap tach adapter $10 plus postage.
    This small board adapts a Tachometer to up to 4 individual coil packs, capable
    of handling 4, 6 or 8 cylinder wasted spark applications



    Installation is straightforward:

    * Connect Coil 1,2,3 and 4 to the drive signals to each coil packs as necessary.
    * Connect the tach output to the input of your tachometer.
    * Wrap the board with electrical tape or shrink tubing- the board is small enough
    to integrate into your wire harness / bundle.

    Example Wiring



    Here is the the web address
    TachAdapter - Autosport Labs

    I have purchased one from their website with paypal.
    So I will try it when it gets here in about 2 weeks time.

    This could be used on other vehicles for engine swaps etc.

  3. #3
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    Okay as there was no real scale to the photo with the tach adapter.



    And that is 15/16 of an inch.

    TachAdapter - Autosport Labs

    please look at my engine swap to see it get wired up.
    http://www.lxforums.com/board/f64/re...ml#post3863039

  4. #4
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    you are trying to attach a tachometer for engine rpm?

    typically you tap into an ignition coil for that I believe.
    "A world full of 100% Prius owners is still a world 100% dependent on oil" ~ E. Musk

  5. #5
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    Quote Originally Posted by Mr. iNCREDIBLE View Post
    you are trying to attach a tachometer for engine rpm?

    typically you tap into an ignition coil for that I believe.
    tap into a coil or injector is what Ive always done
    CAM ONLY RECORD HOLDER 12.34 @108.89 & 1.66 60'
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  6. #6
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    Quote Originally Posted by moparmike610 View Post
    tap into a coil or injector is what Ive always done

    me too, and transmission tail shaft for speedo, or now you can get a get speedo gears for older (pre 1980 usually) transmissions that convert the speedo gear output to electronic as opposed to a cable setup.

  7. #7
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    With the above adapter it takes the signal to the ignition coils and turns it into a true rpm signal.
    Coil packs are one coil for every 2 cylinders usually, so only tapping into one coul means you're
    tach will be only showing a third of the true rpm.

    As I have plenty of used insulin pens, and the cap/cover is
    the right size I decided to use a bust one as a holder and
    protector for the tach adapter.

    I show an undamaged insulin pen next to the cap and
    snapped off end how it will go together.
    (the insulin cartridge was undamaged)





    Almost done the below picture is before I used gasket
    seal to glue and seal the bits together.


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