The ornamental design for a displaypanel for vehicles, as shown and described.
1. Display panel for vehicles
1.1: Perspective
1.2: Front
1.3: Back
1.4: Left
1.5: Right
1.6: Top
1.7: Bottom
1.8: Reference
The broken lines indicate portions of the article that form no part of the claimed design; the dot-dashed lines in reproductions 1.1, 1.2, 1.3and 1.8define the boundaries and do not form no part of the claimed design; reproduction 1.8is a reference view showing the claimed design installed in the vehicle; the broken lines showing of the vehicle interior in reproduction 1.8is provided for the purpose of illustrating environmental structure and form no part of the claimed design.