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Dakota Universal Speedo Corrector: An easy alternative to the HyperTech

Discussion in '2nd Gen. Tacomas (2005-2015)' started by EatSleepTacos, Aug 1, 2019.

  1. Aug 1, 2019 at 12:54 PM
    #1
    EatSleepTacos

    EatSleepTacos [OP] Well-Known Member

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    EDIT: The SGI-100BT is the new replacement for the SGI-5E. It will work just like I illustrated, with the added functionality of Bluetooth.

    First off I can't take credit for this, that goes to @buyobuyo. I'm merely making this thread to try and get this product more visibility. Until I texted him, I thought the hypertech was the only solution to correcting the speedometer. I tried a hypertech, and it didn't work. Plugged it in, went for a drive, and speed read 0. My theory is it was something to do with manual transmission vs auto transmission since they read speed from different places. Manual is t-case output (transmission on 2wd) and autos is ABS sensors.

    The Dakota Digital SGI-5E is a universal speedometer (and subsequently odometer) correcter. If you try and read through the manual, it's confusing AF and intimidating, so I would like to make it easy for you.

    The down and dirty is all you're doing is intercepting the speed wire, and sending both halves into the unit. You're also providing the unit with power and a ground. That's it. 4 wires.

    Here's how you take your dash apart.

    http://hypertech.com/ProductManuals/inlinespeedo/730107_VSS_Instlltn_Prcdr.pdf

    First off, supplies. Here is everything I bought to make this happen.

    https://www.amazon.com/gp/product/B016DVDBZ0/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1

    https://www.amazon.com/gp/product/B07G844GCY/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1

    https://www.amazon.com/gp/product/B001MPW54G/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1

    https://www.amazon.com/gp/product/B00HT9XJLW/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1





    First step, locate the speed wire. On my 2005 SR5 it's the red and yellow wire (pin 6). On jeremy's truck, and one other write up I found, it's the same wire. That's the hardest part of all of this is figuring out the wire. Once you verify that, it's easy.

    Cut the wire in half. The side that is coming from the connector, goes into OUT2. The other side SIGNAL IN.

    Then you just need power and ground. I used the wire taps to tap into the black/white wire for ground.

    For switched power, I stole from the light green wire that goes to the dash dimmer. Can be pulled from any switched power source.



    I know at first glance this may look intimidating. But read it a couple times, and it's not bad at all.

    For calibration, just follow the instructions. For the one setting, you want High->High (this will make sense later)


    upload_2019-8-1_15-51-52.jpg upload_2019-8-1_15-57-29.jpg

    [​IMG]

    [​IMG]
    [​IMG]
    [​IMG]
     
    Last edited: Apr 6, 2020
  2. Aug 1, 2019 at 5:53 PM
    #2
    buyobuyo

    buyobuyo Read The Fucking Manual

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    A thing or two...
    Nice write up, Randy. :thumbsup:

    Here's the link to my install in my build thread. https://www.tacomaworld.com/threads/buyobuyos-build-thread.511891/page-15#post-20240110

    We connected into all the same wires, but after looking at the wiring diagram again, you can pull switched power from the same connector as ground and the speed signal. It's the violet wire (pin 21).


    #randyfab now offering electrical. :rofl:
     
  3. Aug 1, 2019 at 6:00 PM
    #3
    EatSleepTacos

    EatSleepTacos [OP] Well-Known Member

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    I was a little nervous because my speed wire was faded and old and didn’t look red and yellow, but more brown and white. I said fuck it though since it was pin 6 and close enough. Glad it worked out for me.
     
    buyobuyo likes this.
  4. Aug 5, 2019 at 3:59 PM
    #4
    EatSleepTacos

    EatSleepTacos [OP] Well-Known Member

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    Bump for visibility so it doesn't get buried
     
  5. Aug 5, 2019 at 7:23 PM
    #5
    mikalcarbine

    mikalcarbine Well-Known Member

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    Does this only change the speedometer speed and not the odometer?
     
  6. Aug 6, 2019 at 1:35 AM
    #6
    EatSleepTacos

    EatSleepTacos [OP] Well-Known Member

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    It corrects both
     
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  7. Aug 6, 2019 at 3:37 AM
    #7
    buyobuyo

    buyobuyo Read The Fucking Manual

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    A thing or two...
    The speedometer and odometer are generated from the same signal, so fixing one fixes the other.


    Another positive not listed in the OP is that the Dakota Digital unit is half the price of the Hypertech.
     
  8. Aug 6, 2019 at 4:19 AM
    #8
    kidthatsirish

    kidthatsirish Well-Known Member

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    Awesome CB setup, TRD leaf springs, matching camper shell...more to come some day.
    I am assuming this is done for correcting the vehicle after a lift with bigger tires
     
  9. Aug 6, 2019 at 6:49 AM
    #9
    Steve_P

    Steve_P Well-Known Member

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    My odometer read 4-5% high from the factory, with OE tires. The speedo also reads high
     
  10. Aug 6, 2019 at 8:29 AM
    #10
    kidsmoke

    kidsmoke Well-Known Member

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    This is awesome, thanks to you guys for doing the legwork and sharing it this way. I'll be all over this.

    Can't believe what a difference bumping from 245/65/16 (stock on a SR5 4x4) to 265/70/16 (stock on a Baja) made in my guage output. when I lift and go even bigger, this will be in place and ready to go.

    :cheers:
     
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  11. Aug 6, 2019 at 8:46 AM
    #11
    EatSleepTacos

    EatSleepTacos [OP] Well-Known Member

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    That, and also a regear (this only affects manual transmissions). Manual transmissions read speed from the driveshaft. After a regear, the driveshaft spins much faster
     
  12. Aug 6, 2019 at 9:32 AM
    #12
    kidthatsirish

    kidthatsirish Well-Known Member

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    Awesome CB setup, TRD leaf springs, matching camper shell...more to come some day.
    So you indicate you are driving faster than you actually are?

    About how much does a typical regear throw you off? I know that would depend on what new ratio, but I am constantly told I am indicating about 5mph faster than I am actually going, mine is manual and I did buy it slightly used, so I wonder.....
     
    Last edited: Aug 6, 2019
  13. Aug 6, 2019 at 11:27 AM
    #13
    EatSleepTacos

    EatSleepTacos [OP] Well-Known Member

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    Mine was wayyyyy off. I went from 3.73 to 4.88 and have 34” tires. I would be actually driving 65 mph but my speedo would read 80 mph.
     
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  14. Aug 13, 2019 at 5:49 AM
    #14
    mooddog280Z

    mooddog280Z Active Member

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    Y'all are saints. I have been wanting to correct the speedo for a while but figured id live with it for the price of a hypertech lol. This is way more reasonable and a guy with a 6MT already verified it, I say again y'all are saint.
     
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  15. Aug 13, 2019 at 6:28 AM
    #15
    EatSleepTacos

    EatSleepTacos [OP] Well-Known Member

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    You’re welcome! The exact reason I made this thread.
     
  16. Aug 21, 2019 at 2:20 PM
    #16
    mooddog280Z

    mooddog280Z Active Member

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    Got mine installed today and roughly calibrated. Not sure if phone gps speed app is right or not lol. We will see how it does, i had one weird thing that happened, while decelerating it had a weird jump up of like 15mph then right back down. Anyone else have that issue?
     
  17. Aug 21, 2019 at 2:28 PM
    #17
    TegoTaco

    TegoTaco Well-Known Member

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    What about autos?
     
  18. Aug 21, 2019 at 2:35 PM
    #18
    EatSleepTacos

    EatSleepTacos [OP] Well-Known Member

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    I can’t say I’ve seen that happen yet.

    I don’t see why it wouldn’t work. All you have to do is make sure you’re intercepting the speed sensor wire.
     
  19. Aug 21, 2019 at 6:14 PM
    #19
    buyobuyo

    buyobuyo Read The Fucking Manual

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    A thing or two...
    I've seen mine jump randomly. Usually it's around 45-55 mph. It will dip 5-ish mph for a second and then jump back to where it should be. I've only noticed it while accelerating or cruising. It happens randomly, so I'm not too worried about it.
     
  20. Sep 7, 2019 at 5:47 AM
    #20
    Justanotherhemi

    Justanotherhemi Cpt Miguel Schwemmer’s unofficial 1st mate

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    Bump. Op you should have removed the dash bulb for the TPM while you were in there
     
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