Indiana Code Title 2. General Assembly § 2-2.1-1-6

Sec. 6. (a) The president of the senate shall preside at the organizational meeting during the election of the president pro tempore and other officers of the senate.

(b) The oath of office shall be administered to senators-elect by the chief justice of the supreme court of Indiana, or an associate justice designated by the chief justice.

(c) The president pro tempore and such other officers as may be determined by the standing rules and orders of the senate shall be elected.  The oath of office shall be administered to the president pro tempore by the chief justice, and to the other officers by the president of the senate.

(d) In the event there is no president or the president is absent or unable to serve, the chief justice of the supreme court or an associate justice designated by the chief justice shall preside during the election of the president pro tempore and, upon being elected and sworn, the president pro tempore shall take the chair and conduct the further business of the senate until the vacancy in the office of president is filled, if there is no president, or until the president is able to serve, if the president is absent or unable to serve.