wiring diagram for honda nv400

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Hey there, Pete's trusty old honda has a wiring issue, the instrument cluster that has the temperature gauge and the rev counter is not working, he says in between foul language it would be a lot easier to sort if he had a wiring diagram, his bike is a custom, but we are hoping the wiring on the conventional nv400's might be the same and someone might have a wiring diagram etc, can anyone help cheers L

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well I managed to download the wiring diagram for the nv 750, which according to the info I have gleaned from the internet, is essentially the same as the 400 in that respect, so heres' hoping..
here's the link if anyone wants to download the service manual for a honda nv750

http://www.nv750.ru/service/service.htm