For each item, there should be three values added to the file "settings-values.lua" and a technology .png graphic needs to be created and added. You can copy, then RENAME and reinsert the file "efficiency-generic.png" into the technology graphics folder after renaming the file to "efficiency-[itemname].png" for this, or use photoshop (or other paint program) to create specific technology graphics yourself with the proper item icon. the mod does not generate icons dynamically, unfortunately. if anyone knows how to do this, (or has seen this technique being used) i'd love to be shown how that works.
The syntax of the lua list must be done correctly. entries must be separated by commas, have quotes in the correct places, and the list must end with a single angle-bracket "}", when editing, it's common to mistakenly leave these so that there's two closing-brackets. i do this all the time...