Yes, you'll have to remove the seats to get to the large tank bolt, Remove that and you can lift the tank from the back up about 6-8 inches. The front will pivot on the rubber pucks Intimid8or mentions above. You won't be able to lift it much further without unplugging the electrical connection and unhorsing the fuel line.
Are you sure the rattle is under the tank? My speedo display gets loose from time to time. The two front allen head screws only screw into rubber washers and work their way loose, also make sure the back screw on the housing is snug.
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-Sandman
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