TOKYO, Feb 3 : The dollar held gains on Tuesday as positive economic readings and shifting expectations for Federal Reserve policy outweighed concerns about another U.S. government shutdown. The Aussie rose after the Reserve Bank of Australia delivered on an expected rate hike, the first of three major central bank decisions this week. The yen remained lower days before a pivotal election in Japan, and as the finance minister played down comments from the nation's premier on the benefits of a