Join Date: Jan 2009
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lost speedo completly.
put new sensor in gear box, still didn't work
three wires out of sensor, black (earth), yellow(feed from ignition) and greyish (sensor/pulse).
connect 12 volt bulb across black and yellow with ignition on and it should light up. If it does you probably have a sensor failure (£37 from renault)
If it doesn't then connect bulb between yellow and chassis of car, then it should light up. If it does you have an earth fault on the black lead, cut black wire and make new earth to chassis from the plug end.
this was my problem, and is now fixed.
If it still doesn't light up, then it is a live feed problem (unlikely)