Tails and Gauge Cluster out....

hey guys, i was working on my car when the taillights and gauge cluster light went out. they share a fuse, so i checked it. it was blown so i replaced it with another 15amp. but it still doesn’t work…any ideas or suggestions? i have a guess that it may be the ground somewhere, but where do i go to check that? thanks…

eh?

can anyone help me?