Right, to move the dial;s you have to take the front of them off, a few clips along each egade and seeral screws dotted around (5 i think), then you have to remove one screw (top left) and loosen one screw (bottme right) to remove the spedo gauge. There are no wires to the sockets, it all printed on that plastic stuff attached to the back of the dials, on mine im sure there was 2 bulbs of each big gauage, in opersite corners.
As for the differetn coloured bulbs, they are all clear, they ar coloured by a coloured piece of plastic between the bulb and dial face.
I would imagine reanult would charge a fair bit for doing this as you have to remove a fiar bit of dash, (top, steering wheel shroud, and bit under stearing wheel), when i first did this it took me about 30 mins to completely remove the dials.
I presume this IS a Mk1 clio, as you have sed its a Ph3