It's not done with those instruments by just replacing the faces, and the guys in the article you have linked miss most if not all of it. But you should know this already. You wrote somewhere else here, that you would ask for professional help even to take off a float bowl from the Dellortos. I'm just wondering what actually makes you think that you will be able to "restore" your clocks by your own then? I.e. cleaning, relubricating with the proper liquids, refilling the damper, readjusting, getting them sealed watertight again? :
BTW, tach and speedo cables do not like to be bend as shown in your photo...