The ornamental design for a pickup for guitar, as shown and described.
FIG. 1 is a front side perspective view of a pickup for guitar showing my new design;
FIG. 2 is a rear side perspective view thereof.
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines in the drawing views are included for the purpose of illustrating the unclaimed portions of the pickup for guitar and form no part of the claimed design.