Where does this electrical box go?

VR128, got it.

The only upgrade (?) would be the square back Alt. only since it is on hand.
The stereo will be upgraded and I would like to add an Amplifier.

At the moment, no other electrical work will be done. No by pass of the amp meter. I just don't see the need. I just wanna get this thing up and running. And then work on upgrading things later.