The ornamental design for a dashboard for vehicles, as shown and described.
1. Dashboard for vehicles (part of)
1.1 is a front perspective view of a dashboard for vehicles embodying my new design;
1.2 is a front elevation view thereof;
1.3 is an enlarged front perspective view thereof;
1.4 is an enlarged front elevation view thereof;
1.5 is an enlarged and partial front elevation view thereof taken of its right side corner; and
1.6 is an enlarged and partial front elevation view thereof taken of its left side corner.
The broken lines in the reproductions illustrate portions of the dashboard and an environmental steering wheel structure that form no part of the claimed design.