I do the same thing tech does.

Fwiw, I use clear PVC tubing from NAPA and run several wires inside.
A few shots of silicon lube help get the wire through the PVC if you're filling it to capacity wire-wise.

Do the same with the battery cable.

Run the batt cable down one rail and the fuel line down the other.

Grommet entry and exit points as well as making sure the grommets will stay put.