the derbi (motoplat) electronic ignition is a transistor type, kinda like a jawa, and they fail often. I definitely wanna stick with my points setup.
I believe you are able to unbolt the starter ring gear from the DS50 flywheel and bolt it onto a points flywheel. at least thats what im hoping (some variants came with electric start too)
so to answer your original question, the electronic ignition is 12v DC output for lights so you need to have the load regulator and possibly a small battery (electronic geniuses, back me up here?)
PS: yellow/black is the color for ground wires on variants and ds50s
let me know about that electric start gear if you wanna ditch it.