Gauer was born in Milwaukee on November 30, 1892. He graduated from the Milwaukee public schools and worked as a printing press operator. When elected to the Assembly in 1922, he had been a member of the Pressmen's Union and of the Socialist Party for more than twelve years.
In 1926, Smith was not a candidate, and Gauer again faced Volmer for their old seat. Gauer won with 1984 votes to 1952 for Volmer and 384 for independent socialist Edward C. Werner. Gauer was assigned to the standing committees on excise and fees; and on highways.[4] Gauer was not a candidate for re-election in 1928, and was succeeded by Republican Alfred Buntin.
As of 1946, Gauer was still an inspector for the City of Milwaukee.[5]