[projectRDM]

Hook it up right there with a ring terminal. You may need a longer bolt though since the OE one is short, it's a regular M6x1.0.

You will still need a fuse on your power wire, whatever is suggested from the manufacturer, probably like a 50A or so. As far as overloading it though, an 800W amp, *if* it is indeed 800W (doubtful), would still draw less current than the starter.