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Thread: Electric speedometer hookup

  1. #1
    Fuel Injected!
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    Electric speedometer hookup

    Can I use the VSS signal for the SW electric speedometer? If so where do I tap into it?

  2. #2
    GearHead-EFI Vendor!
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    Hi, which EBL Flash system do you have? And what type of input does the SW speedometer require? The VSS input/output varies among the systems.

    Odds are you can.

    RBob.

  3. #3
    Fuel Injected!
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    VSS

    Quote Originally Posted by RBob View Post
    Hi, which EBL Flash system do you have? And what type of input does the SW speedometer require? The VSS input/output varies among the systems.

    Odds are you can.

    RBob.
    I have the EBL Flash-II
    The speedometer needs 12v
    Input 3K-100K per mile Hall effect sensor or magnetic sensor
    Attached Files Attached Files

  4. #4
    GearHead-EFI Vendor!
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    The typical PPM for TBI setups is 2K PPM. The VSS input to the ECM is on A10, it is a digital signal that swings from 0 to 12 volts. So that part is OK.

    If the vehicle has a magnetic VSS, that is usually a 4K PPM or higher (depends upon which type). So that can be used.

    RBob.

  5. #5
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    Quote Originally Posted by RBob View Post
    The typical PPM for TBI setups is 2K PPM. The VSS input to the ECM is on A10, it is a digital signal that swings from 0 to 12 volts. So that part is OK.

    If the vehicle has a magnetic VSS, that is usually a 4K PPM or higher (depends upon which type). So that can be used.

    RBob.
    I have a 2K sender from JTR. Can I just splice into the A10 lead for the speedometer?

  6. #6
    GearHead-EFI Vendor!
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    That won't work with the SW speedometer, as the lowest it requires is 3K PPM.

    You may be able to use a Dakota Digital SGI-5 box to bump the VSS PPM signal to a higher value. And feed the SW speedometer from it. I looked at the SGI-5 instructions and bumping up a 2K signal is not mentioned. Best to get in touch with them to see if it can.

    The input to the SGI-5 box would be from ECM pin A10. A digital, 2K PPM signal.

    RBob.

  7. #7
    Fuel Injected!
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    Quote Originally Posted by RBob View Post
    That won't work with the SW speedometer, as the lowest it requires is 3K PPM.

    You may be able to use a Dakota Digital SGI-5 box to bump the VSS PPM signal to a higher value. And feed the SW speedometer from it. I looked at the SGI-5 instructions and bumping up a 2K signal is not mentioned. Best to get in touch with them to see if it can.

    The input to the SGI-5 box would be from ECM pin A10. A digital, 2K PPM signal.

    RBob.
    Another option that may be considered is to add either a SW vss P/N 82623B or JTR vss 4PRS mounted in tandem and wired independently to their respective device. My Jeep is set up this way for a variety of reasons and works just fine.
    Ed

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