The ornamental design for a digital tirepressuregauge, as shown and described.
FIG. 1 is a perspective view of a digital tire pressure gauge, showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left view thereof;
FIG. 5 is a right view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is another perspective view thereof.
The broken lines are directed to the environmental structure defining the boundary of the claimed portions of the digital tire pressure gauge and form no part of the claimed design.