What's small orange light on dash 78 Deville

After having a (bad) tune up done (don't ask) I now have a small round orange point of light that stays on. It's located on the dashboard in the
"idiot light" area. Is it an emissions light? How do I get it to turn off?
Thanks for ANY help, Fred Luhn Goldies Plating Service
"New York's Finest Premium Gold Plating Service" online at http://www.goldiesplating.com
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