Try your local NAPA store. That indicator is a very common a part and is used on many types of equipment and applications. If NAPA can't get it try a big truck shop such as a Peterbuilt, Kenworth, Freightliner, Mack or Volvo dealership.
Craig & Donna
2005 Beaver Monterey Laguna IV (aka The Hotel Monterey)
2011 Jeep Liberty Limited