My speedo doesnt work and cannt figure out why, ive done following.

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) Replaced the whole gearbox speed sensor with a 2nd hand unit
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) Rewired the loom at back with new adaptor to gearbox sensor
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) I put positive end of volt meter to speed signal wire(purple with silver trace wire) at back of clocks and negative to earth and got a small signal on meter.

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What is wrong with my speedo they dont work?

The needle was intermit would fly up and down fill the clock etc when i give a bit of the right foot.

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Any ideas.

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