Clio 1.2 revcounter wiring

Does anyone know where the revcounter on this car gets its signal from? 1.2 'D' engine. Its not shown on the circuit diagram in the Haynes manual. Any clues as to the path of the wiring (only one wire I think)?

The symptoms are really strange, car warms up, rev counter slowly drops to reading 0. Turn heater fan on/off, and rev counter occasionally flickers. But in general it always read slow. Could be a bad connection on the instrument pcb?

Any ideas gratefully accepted :)

/Simon

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Simon Wilson
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