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I need some ideas on what could be causing the speedo to not work when I'm driving. I have seen it flick a few times but most of the time it just sits on 0. Also, the fuel and battery gauges don't work.

Can a complete car noob fix it or would it be best to get a mechanic to look at it?

I'm also fully aware it's illegal to drive without a working speedo. But you won't tell will you? :(

Edited by The_Bazzanator
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https://www.sau.com.au/forums/topic/115716-86-r31-gx-skyline-speedo-problem/
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Could be the gauge, they are pretty shithouse, try and find a cheap one to test.

Or the wires for the speedo sender on the gearbox have broken, happened on a couple of 31s I know of, but not massively common. Have a look on the drivers side near the gearbox crossmember, there ill be 3 wires on a plug, check them out.

replacing either isn't too hard, only basic tools required.

try hitting it

seriously the connections on all the gauges wear out, tacho volts and fuel level gauges never work until I give the cluster a good thumping

check obvious things first like if your speedo drive is plugged in.

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