> Am i right in saying .6mm cable is best? And any particular crimp size?
Just make sure your wire size is correct for your crimp size. If its too small the crimp wont grip the wire properly and will pull off.
0.6mm would be fine for the crimp I linked to which is the metric equivalent of a .187 quick disconnect. I assume you need this size for the connectors on the switches. If the crimps are too wide they will normally still go on but will be a bit of a sloppy fit.