Tach Adapter

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Thread: Tach Adapter

  1. #1
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    Tach Adapter

    Hello folks. I just have one question about tach adapter. I have read every thread in here and googled this a hundred times. I am just wanting to know exactly where you get wire going to tach. The post I found said use the black wire on fender well but seriously theres 30 black wires up there. Another person said get it from kick panel. Well thats great there is 100 wires there. I have a book but does not show full wiring diagram. Any help would be great. Like you know a picture or what color the actual wire is. Thanks

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  3. #2
    CelicaSupra.com Member eightsixxmkII's Avatar
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    What tach adapter are you using? Msd 8920? And are you trying to get rpm working on the tachometer?
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  4. #3
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    Yes im using 8920. I have not yet put it in as I usually make sure i know what im doing before I start something. I can easily identify where to get power ground and igt. I just am not sure about tach wire. Its an 85 with a 7mgte yellow plug ecu.

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    CelicaSupra.com Member eightsixxmkII's Avatar
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    I'll look at it today after work if I have time. It's been a couple years since I did the swap, so I forgot which wire I used from the tach.
    Hidden Content
    05 Scion Tc: Sold. Mpg will be missed.
    85 P: New project. No motor/trans.
    86 P Super Deep Red (Cali Car):7mgte/w58.
    98 4runner Sr5: Daily driver. Parts/dead car hauler.
    96 Avalon: New daily.

  7. #5
    CelicaSupra.com Member 4SFED's Avatar
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    I used the check plug on engine harness.
    Dave Harrison

    current lineup and year acquired:

    '85 white Mark2 7mgte 5sp 1990
    '85 white Mark2 7mgte Auto 2009
    '84 maroon Mark2 6mge 5sp 2013
    '86 red Mark2 7mgte 5sp 2016
    '85 black Mark2 6m Frankenmotor 5sp 2017

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  8. #6
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    I did the same thing as 4FSED. I mounted the MSD Tach Adapter on the driver shock tower, all your wires are there. I searched the forum here and found where the wires go and works like a charm. This may help. http://www.celicasupra.com/forums/sh...g-guide/page16

  9. #7
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    Also it really helps if u have the toyota electrical wiring diagram for the year of car. I was able to trace the exact black wire near where the 5m coil pack used to be. Then find out where it goes to the tach on dash. I tested for continuity and bingo.

    Sent from my SAMSUNG-SM-G925A using Tapatalk

  10. #8
    CelicaSupra.com Member eightsixxmkII's Avatar
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    4sfed, and whiteys idea is better than the route I took. I have my Msd 8920 located in the engine bay and ran the wires from the firewall to the inside. I originally had it on the side of my center console, but it's pretty loud.
    Hidden Content
    05 Scion Tc: Sold. Mpg will be missed.
    85 P: New project. No motor/trans.
    86 P Super Deep Red (Cali Car):7mgte/w58.
    98 4runner Sr5: Daily driver. Parts/dead car hauler.
    96 Avalon: New daily.

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