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Another your choice situation but I wouldn't remove the filler neck gasket. Those gauges are inaccurate so I mark the edge of the cap where empty is. That way I can tell roughly how close I am to E when in the seat or standing behind it. The same type gauges on the 300 & 400 machines are worse because of differences in tank shape/depth. I don't want to run the tank down too low, to keep crud out of the carb/injectors, so I check/adjust fuel level before each use. A marked, measured stick kept in the shop is the most reliable fuel gauge IMHO.