Fuse block advice

diymirage said
this may be a good time to suggest you look into bypassing the amp meter
also, check in with @TrailBeast , hes pretty good with electrical

The 76 model amp gauge is different from all other models of a-body. No need to do anything to it.
The car has a radio fuse that should handle the typical aftermarket stereo head. Amplifiers require another power supply to their location.