offically lost with my gauges

[red rumbler]

hey guys so basically last year i had a stereo issue so i found a bad ground and fixed the ground but in the prosess i bumped to wires under the dash ( both black ) and now my tail lights . license plate light and gauges wont work? i checked my fuse block and my switch both are fine i know they are on the same circuit so if the back lights go out i know because my gauges go out aswell but i have no idea where else to look. are there any in line fuses links or anything you can think of or any solutions?