Here is the section of Indiana Code that applies to your question, I believe...


IC 9-19-7-2
Handlebars; brakes; footrests; lamps and reflectors
    Sec. 2. (a) Except as provided in subsection (b), a motorcycle operated on the streets or highways by a resident of Indiana must meet the following requirements:
       (1) Be equipped with handlebars that rise not more than fifteen (15) inches above the level of the driver's seat or saddle, when occupied.
       (2) Be equipped with brakes in good working order on both front and rear wheels.
       (3) Be equipped with footrests or pegs for both operator and passenger.
       (4) Be equipped with lamps and reflectors meeting the standards of the United States Department of Transportation.
   (b) A motorcycle manufactured before January 1, 1956, is not required to be equipped with lamps and other illuminating devices under subsection (a) if the motorcycle is not operated at the times when lighted head lamps and other illuminating devices are required under IC 9-21-7-2.
As added by P.L.2-1991, SEC.7. Amended by P.L.1-1992, SEC.49; P.L.63-1994, SEC.1.

And in the great morass that is the DOT's standards, I found a chart on this page:

http://ecfr.gpoaccess.gov/cgi/t/text/text-idx?type=simple;c=ecfr;cc=ecfr;sid=...

It is table three.  Scroll almost all the way to the bottom of the page to find the table.  It looks like they require four turn signals.  2 amber, and 2 red or amber.  What a chore to find that out.  I'd just ask a cop, but he will probably tell you to light 'er up.