97 cb400 Tachometer problem, please help

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Saash30
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97 cb400 Tachometer problem, please help

Post by Saash30 » Fri Oct 19, 2018 7:18 am

Hi all.
I need help from you. I bought cb400 big project 1.
Converted to cafe.
My huge problem is that I can't get tachometer work.
I had Chinese tachometer installed and worked only backlight.
So i bought exactly same new one. Im having huge problem of finding the place where should I conmect the engine signal wire. We did try to connect to coil but nothing happened. So only wsy I've got needle working is when i try to connect wire with spark plug cable, but then it's not stable and immediately i felt lost of cylinder, power of bike was gone. But tachometer was working this way. Im sure it's wromg so i disconnected from spark plug and power is back cylinder working. Im out of ideas so fo my friend. I cant bring any shop because im in Cambodia and they messing up all bikes. I had million wires before in front lamp and my frienf had to spend 2 days to get new speedometer, fuel gauge working properly. But he can't find way to put tacho in work, like I said only when we connected to spark plug but then hige power loss and tacho jumping like crazy.
Please can someone tell me where should we connect this wire and how? I have on left and right coil block's with 2 small wires (gray) & (yellow-blue).
And sorry for long book and broken English but i look all google and YouTube and cant find a solution.
All other wires connected correctly ad my friend electric and worked half life in car service but this time he say his head blowing out with this one.
Thanks in advance,
Aleks!
https://imgur.com/a/7Kr5PP3
https://imgur.com/a/H62Z3JT


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