The ornamental design for a keyingconfiguration for an electrical connector, as shown and described.
FIG. 1 is a perspective view of a keying configuration for an electrical connector showing my new design, the portion in phantom lines in the figures forming no part of the claimed invention;
FIG. 2 is a front view thereof;
FIG. 3 is a side view thereof, the opposite side being a mirror image; and,
FIG. 4 is a top view thereof, the bottom view being identical.
The portions of the connector that are not shown form no part of the claimed design.