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A UK Site Dedicated To The Suzuki C800, VL800, VX800, M800, VZ800, VS800, C50, M50 Model Intruder / Boulevard / Marauder
 
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 help universal tachometer install

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aslexx
Prospect



PostSubject: help universal tachometer install   Wed Jun 14, 2017 8:01 am

Hi Guys,
I have purchased a cheap universal tachometer (pics below) and it came without mounting instructions.
i was wondering maybe you can help me with some suggestions because if have found different install schemes on internet.
I suppose that the thin black and red wires represent + and - for the in tacho light.
Now i have left with 3 wires (thick black, thick green and thick yellow/black).
I am guessing green is for spark wire. Here I have my first question : do i need to split this wire to both sparks ?
Also I am guessing black wire is for ground and needs to be connected where ?
Third and last wire is yellow / black which is clueless for me....
Any help is greatly appreciated (except if you tell me to throw away this tacho :)))))))


BTW my bike is a '98 suzuki marauder vz800.Thank You !


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aslexx
Prospect



PostSubject: Re: help universal tachometer install   Tue Jun 20, 2017 12:52 pm

OK, here's what I've found out :

1. black long thin wire goes to ground
2. red long thin wire goes to positive on ignition - both these wires represent the backlight

3. short black thick wire goes to positive on ignition
4. short green thick wire goes to ground (preferable straight on battery)
5. short yellow/black thick wire goes to positive side of coil...

Wish me luck !!!
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Bugera
Prospect



PostSubject: Re: help universal tachometer install   Wed Jun 21, 2017 8:26 pm

Actually, some times ago, I was doing the same, but my tachometer was more correct with the scale to 8000rpm max, and made special for v-twin engine, and this one is up to 14000rpm, so looks like it is for 4-inline engine, and the ignition system it is very different in your engine (v-twin), and 4 cylinders. My tachometer had only 4 wires, 2 of them was positive+, the difference only one have to be connected switch light "on"+ and another to + after ignition key "on". I connected both to ignition+ d/t light is always "on" on motorcycle after ignition "on". Another wire (black) connected to ground -. you can connected it anywere to the frame. The last one (green) have to be connected to ignition coil (according to the manual). After connecting this I get the rpm on tach it is approx. 2 times less than it is have to be (according to idle, and my ear). I went to motorcycle service to fix this problem. they fixed it by connecting this green wire to the both ignition coil. after that the rpm value on tach becomes more correct, but the tach arrow was jumping a lot through the all scale during driving so the information from this tach and have it is working was minimum, and after some time I removed it and not using it any more. In case of you I am not sure that you will get any positive and acceptable result on connecting tach for 4-cylinders engine to 2-cylinders. Just check, may be there is any jumpers on tach for switching between different modes (number of cylinders), but on these cheep tachometers I am sure there is no modes for choosing it.
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aslexx
Prospect



PostSubject: Re: help universal tachometer install   Thu Jun 22, 2017 6:24 am

Hy Bugera,
Your details almost made me think if it worth the bother....now I'm not really sure anymore...Thank You
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