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  1. #1
    Join Date
    Jan 2012
    Location
    warwick ny
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    speedometer

    I have done alot of searching and just want to make sure i understand this correctly.i have a 1992 chevy pickup 2wd 5speed manual with a 2004 5.3 with a 1999 pcm cable throttle body.I want to hook up the vss from the tranny to the pcm and then out from pcm to speedometer.The vss input on the pcm red connector is pin 20 vss low signal pin 21 vss high signal and pin 50 vss output.Does it matter what which vss wire from tranny goes to which pin 20 or 21?Which wire is the output from the drac box to the speedometer so i can connect the output from the pcm behind the glovebox?

    Thanks Joe

  2. #2
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    warwick ny
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    Anyone with any help?

  3. #3
    Will the DRAC box work with a 4000ppm signal? I was told it had to be a 2000ppm signal. I am fixing to order one of the dakota digital signal conditioners to get my speedo working. but then again my DRAC is built into the cluster on my 91. I am runnign a nelson harness and am not sure. I can look on it and see what pin Nelson is useing for the speedo if you would like.
    91 RCSB-- Forged LS7 bottom end, ported LS3 heads, ported LS3 intake, custom EPS cam and a 4l80e.

  4. #4
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    Yeah that would be cool.My drac is behind the glovebox.I won't be using the drac signal.I will have the trans vss go to the 5.3 computer and out from the 5.3 computer to my speedo.

  5. #5
    Ok. I looked on my nelson harness and the speedo comes out of the red connector pin 50. Hope that helps. Let me know how it works out.
    91 RCSB-- Forged LS7 bottom end, ported LS3 heads, ported LS3 intake, custom EPS cam and a 4l80e.

  6. #6
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    Location
    warwick ny
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    I will let you know.I probably won't get it done until next weekend i have to install a boiler this weekend.

  7. #7
    How did it turn out?

  8. #8
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    Jan 2012
    Location
    warwick ny
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    I never got to it because i was prepping for the huricane.I also had no power for 8 days.I will try to get it done if the weather stays nice next week sometime.

  9. #9
    Ok let me know

  10. #10
    Join Date
    Jan 2012
    Location
    warwick ny
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    I finally got around to doing it today.I have a 1999 computer for my 5.3.I connected from vss on tranny LT Green/black to pin 20,Purple/white to pin 21 on red connector.I left the vss connected to drac of my truck.I connected pin 50 red connector from 5.3 pcm to LT Blue/black wire cut from drac for output to speedometer.When i first tried it speedometer read exactly the same as before which was 10 to 12 mph to fast.After messing with hptuners the only way i could get speedometer to read better was to change vss output pulse rate from 4000 to 3600.I am now about 3 to 4 mph fast.I ran out of time but i am pretty close.I am not sure if that is the proper way to adjust it but when i messed with gear ratio the speedometer never changed.I will lower pulse rate more to try to get it correct when i have some time.The truck is 1992.

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