The ornamental design for gas tank location sticker, as shown and described.
FIG. 1 is a front elevational view of a gas tank location sticker showing
my new design, with the rear being a mirror image and with the sticker
being of no substantial thickness; and,
FIG. 2 is a front elevational of a second embodiment thereof, with the rear
being a mirror image and with the sticker being of no substantial
thickness.