The switch for the reverse lights is in the center console, on the shifter assembly. You can remove the shifter plate to access it.
The switch has 6 wires, find the blue and gree thin pair, that's for your back-up lights.
The blue wire has 12V with key on. The green wire sends power to the bulbs in the back when the gear selector is moved to "R". Check the power on the wires with a test ligth or a multimeter.
http://www.austinthirdgen.org/mkport...kup_lights.jpg
Not sure about Indiana state specific safety inspection rules but back-up lights are usually considered a convenience feature, not a safety feature. You can check your local safety inspection rules and make sure whether back up lights are required.
Hope this helps.
Lou