The ornamental design for a color changing fuelgauge, as shown and described.
FIG. 1 is a front perspective view of a color changing fuel gauge in the form of a gauge strip on a side of the fuel tank and in which the fuel tank is empty and the strip is transparent;
FIG. 2 is a front perspective view thereof wherein the fuel tank is slightly filled and the strip is changed from transparent to the color red to coincide with the level of fuel in the fuel tank;
FIG. 3 is a front perspective view thereof wherein the fuel tank is half full and the color red on the strip is increased to coincide with the level of fuel in the fuel tank;
FIG. 4 is a front perspective view thereof wherein the fuel tank is almost full and the color red on the strip is increased to coincide with the level of fuel in the fuel tank;
FIG. 5 is a front elevational view of the strip thereof;
FIG. 6 is a rear elevational view of the strip thereof;
FIG. 7 is a right side view of the strip thereof; the left side view being a mirror image thereof; and,
FIG. 8 is a top view of the strip thereof, the bottom view being a mirror image thereof.
The broken line showing of a fuel tank in the figures forms no part of the claimed design.