1-Drain the tank
2- remove the seat
3- Remove the tank after disconecting the fuel and vacuum hose and the speedo cable at the crankcase .
( don't loose the rubber washer in the connector)
4- Turn the tank upside-down and then you can see the attachments of the speedo.
Greetz
Kropatchek
Use the search and look for speedo rattle you may find a picture of the attachment.