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    VWVortex


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    Thread: Save yourself $60 - make your own MSD 8920

    1. 05-07-2007 08:12 PM #1
      Just take this schematic:

      http://www.msextra.com/manuals...o.GIF

      and put it inside a gutted relay:


      87 to MSD tacho out / megasquirt tach out, 30 to ground, 85 to red/black tacho wire, 86 to switched 12v positive / positive coil lead.

      Unfortunately, I'm getting static from the radio (even when it's playing a CD!) and I don't know how to fix it - I'm no electrician. All the connections were hot glued so they wouldn't rattle and touch. The tach works perfectly, however.


      Modified by jettaflair at 5:14 PM 5-7-2007


      Modified by jettaflair at 5:14 PM 5-7-2007


    2. Member g60manny's Avatar
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      05-08-2007 12:31 PM #2
      but where do you get it

    3. 05-09-2007 03:08 AM #3
      make it

    4. Member
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      05-09-2007 09:51 PM #4
      what does it do?

    5. Geriatric Member need_a_VR6's Avatar
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      05-09-2007 11:15 PM #5
      Quote, originally posted by antichristonwheels »
      what does it do?

      Allows you to run a square wave tach output into a tach made for a spiking coil signal type output.

      -Paul
      1995 GTI VR6 - ??.??@??? 3.6 Power - 12.90@106 R32 power - 12.833@106 12v power
      KPTuned - Official MegaSquirt: Sales - Repair - Installation - Tuning
      Build Thread: The Build Thread "Good Clean Fun"

    6. Member Ultraflux3's Avatar
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      06-12-2012 08:19 PM #6
      Bringing it back up. Has anyone successfully made this?

      I can't seem to find out what the 2H5551 is it looks like a diode in the schematic, but I can't find any diode with that number.

      I would rather spend $5 than $60-$80.
      Corrado

    7. Geriatric Member need_a_VR6's Avatar
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      06-14-2012 09:27 AM #7
      It's a transistor and a common 2N2222A works fine. You will want to gut the relay contacts to get rid of the buzzing.
      -Paul
      1995 GTI VR6 - ??.??@??? 3.6 Power - 12.90@106 R32 power - 12.833@106 12v power
      KPTuned - Official MegaSquirt: Sales - Repair - Installation - Tuning
      Build Thread: The Build Thread "Good Clean Fun"

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