Illuminated Shell Gas Sign Vintage Car Sign Automobilia Gas & Oil. This illuminated Shell sign is perfect for any automotive fan, garage, or man-cave. Measuring 20 inches wide by 21 inches tall and 3 inches deep, it is sure to be a showstopper in any collection. Featuring an US style plug, LED lighting, and an acrylic face, this sign is perfect for lighting up a room with a racing feel and is a must-have for any true enthusiast.