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Thread: tacho wiring

  1. #1
    casual poster EFI TonnEr's Avatar
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    Default tacho wiring

    Hi guys i have just got a new speco tacho and am not sure how to fit it, it has the green,red and black wires. From what i can see as the instructions are not very good, the green goes to the -ve on the coil the black would be ground and the red to acc, the ute as a VQ stato loom and i have found the brown tacho wire or i think it is, how do i test this and where does it come into the wiring?

    Thanks
    Tonner

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    Quote Originally Posted by EFI TonnEr View Post
    Hi guys i have just got a new speco tacho and am not sure how to fit it, it has the green,red and black wires. From what i can see as the instructions are not very good, the green goes to the -ve on the coil the black would be ground and the red to acc, the ute as a VQ stato loom and i have found the brown tacho wire or i think it is, how do i test this and where does it come into the wiring?

    Thanks
    Tonner
    V6 or V8 engine?

  3. #3
    casual poster EFI TonnEr's Avatar
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    5ltr V8

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    Sure why not? 76lxhatch's Avatar
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    The tacho wire goes to the green one, as you said red is +12V and black is ground. Not really sure how you test the wiring first, I guess at least check that it isn't +12V with the ignition on or off before trying the tach, a small test light or multimeter may flicker a bit with the engine running?

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    casual poster EFI TonnEr's Avatar
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    Sweet 76lxhatch thanks, so the green wire doesnt go anywhere near the coil? will check the brown wire tom and let you know how it went

    Tonner

  6. #6
    casual poster EFI TonnEr's Avatar
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    i checked the brown wire today and with the ign on the test light came on and with the motor going it flickered real quick so does that mean its all good to use? I had the test light earthed out on the body so was using the wire as power

    Tonner

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    Sure why not? 76lxhatch's Avatar
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    I'm not so sure about this now - I thought it wouldn't have had any power like that but I've just checked mine and there is some voltage on it exactly as you say. Try it and see, just don't leave it running long if the needle doesn't rise or if it goes all the way up (anything in between can't be wrong).

  8. #8
    casual poster EFI TonnEr's Avatar
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    sweet thanks 76lxhatch, will let you know how it goes

    Tonner

  9. #9
    make lifts go up n down leprkorn's Avatar
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    try this mate:

    red - 12v ignition
    black - engine ground
    green - -ve side of coil or tach terminal on your electronic ignition

    cheers,
    brett

  10. #10
    casual poster EFI TonnEr's Avatar
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    is the tacho term the brown wire? If i get time tom i will try it and see

    Tonner

  11. #11
    make lifts go up n down leprkorn's Avatar
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    can't say honestly. never wired one up to a terminal b4. always to a coil. sorry mate

  12. #12
    Do you ever leave? SS Hatchback's Avatar
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    Like the others have said
    Green usually - ive coil
    Black is Ground
    Red is 12v ACC
    Brown??? Is it for the back light so you can see it at night? usually on autometer its white .

  13. #13
    casual poster EFI TonnEr's Avatar
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    the brown one is the tacho wire from the loom itself or so i am told its not on the gauge itself, its an injected 5ltr if that makes a diff SS, i have tested the brown wire with a test light while the eng is running and it flickers bloody quickly

    Tonner

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    casual poster EFI TonnEr's Avatar
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    finally got off my arse and did a quick hook up, green to the brown tacho wire and all was sweet, thanks for all ya info guys

    Tonner

  15. #15
    Do you ever leave? SS Hatchback's Avatar
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    yeah no problem i was thinking those colours were coming from the tacho but you meant the brown was coming from the loom , slight confusion and all sorted now so well done

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