Update for anyone interested in speedo rattles:
I managed to line everything up with the rubber strips I used on the perimeter of the speedo glass. Problem is the thickness of it yields extra space between the chrome mount points and the speedo's metal mounts. So I used regular 5# bolts with a longer stroke instead of the OEM shouldered bolts.
I fabricated washers out of soda bottle tops. The plastic here is tough enough to not squash under hard pressure when used as a washer. I used velcro felt to cushion the mounts.
For the lower 3 mounts of the chrome nacelle, I used the OEM shouldered bolts but I added two OEM washers instead of one to further cushion vibes.
About the metal tab I mentioned. I had to pay attention to line it up as the extra space from the rubber strips made it tricky to get the right angle to insert the metal tab into.
Once all installed, I used a rubber mallet to tap everywhere on the speedo and nacelle. Not a single vibrating sound! Before, I'd tap the speedo glass with the rubber mallet and I'd get a reverb vibration. Ditto for the area around the speedo. Not a single reverb or vibe!
I still need to take the bike for a spin to confirm that this was a success. But I'm very happy since I had to come up with how to get the regular bolts to fit into the mounts as if they were shouldered (that's where the soda bottle tops idea to create washers was key). Also lining the speedo glass against the chrome nacelle was a job on its own as the fit of the speedo seems to be cocked to the right. I had to play with the placement of the rubber strips to get it all centered, snug and also have the rubber strips layering the perimeter of the glass vs the chrome nacelle (otherwise the rubber strips would not do their job).
IMO the speedo dash needs to be fit very snug against the nacelle and not left floating as many people have. The rubber strips create a great seal to dampen any vibrations.
I really feel that Honda could have done a better job with dampening acoustics of the speedo dash/chrome nacelle. Eve the OEM washers for the shouldered bolts deform and squash after the third time you torque them tight.
I used foam weatherstripping tape on the clear lense of the speedo.
Rubber washers on the 6 bolts.
Everything lined up when installing it back.
Problem with foam is that it eventually squashes. I actually took out some that I had used. The foam used to work in the beginning but no more after a year of use. Thats why I decided to go in and just rubber layer the damn thing.
Tsukayu VTX hard bags & Tour trunk, Saddlemen touring seat with backrest, NC custom windshield, Risers, LED lightbar, Engine guard LED lights, Cobra fatty guard, Rear engine guards, Fender rail guard, Leather tank bib, Passenger floorboards, 12v socket, ISO grips WITH bar weights, Engine chrome, Triple tree cover, Shaft cover, Fenders chrome, Progressive forks & 12.5 inch shocks, All Balls mod, Chrome clock, Adjustable trunk rack