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New tach wiring

Discussion in 'XJ Technical Chat' started by skurtaan, Nov 24, 2019.

  1. skurtaan

    skurtaan New Member

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    Hi guys!
    So I have just removed my Atari, and is connecting up a new tachometer.
    Before I removed the atari and connected the new tacho, the RPM was working correctly. Now with my new tacho, it stays at 0. The backlight is the only thing working, hehe.

    Grey is the Engine signal, right? As shown in picture below, these are the wires I need to connect up my new tach with, am I right?
    Cheers!
     

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  2. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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  3. skurtaan

    skurtaan New Member

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    I have done the wiring changes "how to remove the rectangular instruments". Both backlight and frontlight are connected, and working.
     
  4. XJ550H

    XJ550H Well-Known Member Premium Member

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    gray wire is signal wire from coil and tci
    what brand tach did you buy ?
    not all of them work like a yamaha tach
     
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  5. skurtaan

    skurtaan New Member

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    That’s what I thought, thanks.
    I bought a cheap one of ebay, universal fit(picture below). Can I use a multimeter on the signal wire to see if the tach gets signal?
     

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    Last edited: Nov 26, 2019
  6. jayrodoh

    jayrodoh YimYam Premium Member

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    Hard to say what tach you bought exactly from a pic, I think it's the one in the following link. All the ones I looked at indicate the yellow or yellow/black wire is the signal wire but there are no specifics that indicate what that signal should be (i.e. switch ground from coils, wrapped around a spark plug lead). Some of these gauges have a long black wire as ground and a short black wire as switched positive. Yikes. Can you share more about the specific model and exactly how you have ALL the wires hooked up?

    https://www.ebay.com/itm/13000-RMP-...a=0&pg=2047675&_trksid=p2047675.c100005.m1851
     
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  7. skurtaan

    skurtaan New Member

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    Yes, that's the tach.
    So I got the Long black and short green connected to my bike's black.
    The Short Yellow/Black to my bike's grey cable.
    and the Long red, and short black to my bike's brown cable.

    Wire Connection:
    Long red- positive, Long Black- Negative
    Short Green- Ground,Short Yellow/Black-Engine Signal
    Short Black- power/ignition lock positive
     
  8. skurtaan

    skurtaan New Member

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    Yes, that's the tach.
    So I got the Long black and short green connected to my bike's black.
    The Short Yellow/Black to my bike's grey cable.
    and the Long red, and short black to my bike's brown cable.

    Wire Connection:
    Long red- positive, Long Black- Negative
    Short Green- Ground,Short Yellow/Black-Engine Signal
    Short Black- power/ignition lock positive
     
  9. XJ550H

    XJ550H Well-Known Member Premium Member

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    you may have to wrap signal wire to spark plug wire to get a signal.

    problem is the tach adjustable for 1,2 4 cylinder motorcycles?

    Yamahas have a wasted spark ignition. That means that both cylinder pairs off of the ignition coils fire EVERY time piston come to top dead center, intake and exhaust.
     
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  10. skurtaan

    skurtaan New Member

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    I actually don't know if it's adjustable. It just says universal.
    So by wrap the signal cable, you mean the signal cable from tach goes into the spark plug wire? And where on the spark plug cable should I connect the signal cable? Im kinda green to connecting a wire onto a spark plug wire.
     
  11. XJ550H

    XJ550H Well-Known Member Premium Member

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    if that is how it works you would wrap the wire around the sparkplug wire. you could use a second wire to do this with and use a connector for the connection.
     

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