Since Mac128 kindly answered the other questions, I can only add that the 22AWG harness is the one that connects the logic board to the analog board (i.e., not the one shown in your photos). The 18AWG version is shown in this Mac Plus photo:
(You can see it connects at the logic board just below that floppy drive ribbon cable, and then it leads up to the analog board (although you can't see the connector because it's behind the CRT yoke in that photo.)
Mac128 is also sensitive to keeping 128k Macs in their stock condition, and I respect that. I was merely speaking from a standpoint of practically and electronic soundness. If you want to say you have a 100% stock machine, then don't remove the upper shield. But if you run it often and heat is a concern, then it should be removed. (Just don't report that here so your words won't upset the purists. :beige: )
(You can see it connects at the logic board just below that floppy drive ribbon cable, and then it leads up to the analog board (although you can't see the connector because it's behind the CRT yoke in that photo.)
Mac128 is also sensitive to keeping 128k Macs in their stock condition, and I respect that. I was merely speaking from a standpoint of practically and electronic soundness. If you want to say you have a 100% stock machine, then don't remove the upper shield. But if you run it often and heat is a concern, then it should be removed. (Just don't report that here so your words won't upset the purists. :beige: )