The ornamental design for a dashboarddevice, as shown and described.
FIG. 1 is a front view of a dashboard device showing the new design.
FIG. 2 is a bottom view thereof without a base attached.
FIG. 3 is a top view thereof.
FIG. 4 is a left side view thereof.
FIG. 5 is a right side view thereof.
FIG. 6 is a back view thereof.
FIG. 7 is a front, top right perspective view thereof; and,
FIG. 8 is a back, top right perspective view thereof.
The design is the visual features of the dashboard device shown in solid lines in the drawings, whether those features are features of one of shape, configuration, ornament or pattern or are a combination of any of these features. The features shown in broken lines in the various Figures are for illustrating environmental structure and form no part of the claimed design.