So, a friend taught me how to solder. Once you learn to do it correctly, it is so easy that you will laugh at yourself for twisting wires. Also, it's great for adding length to wire. You cut one too short-- no problem. Grab some heat shrink, slide it way down the line, end-butt (without twist, push the wires into each other, end to end) the wires and apply heat and liquified solder metal... slide the heat shrink up over the joint and warm it up. You no longer have a junction point.
Once you learn to solder... you will want to learn to weld!!
The wire and ends are so big, there is not room to put them on the relay... I've not seen a simple fuse holder for 8 gauge wire, and you MUST have fuse/breakers in line.
8 Gauge is where you start to see more LUG type connectors instead of crimp on.