As
@Katfish said, it is the top right fuse. Labeled
INSTR↑ ↑LPS for
Instrument Lamps on the earlier E-Bodies but labeled
FIVE↑ ↑5 on 1973-74 models. Look closely at the fuse block on the side and you will see the fuse size (
5A).
Below is a photo of the 1973-74 Challenger fuse block (Part Number 3879536 / 3588665).
Your 1973 DODGE Service Manual will list the fuse sizes in Section 8 Electrical under the SPECIFICATION section, under
FUSES.
The second photo is the 1970 version with FUSES details.