Although it looks like a mess there is order to this chaos. One way to lighten the load is to link like-wires together. For instance the dash lights (green wires), power (yellow wires), and ground (black wires) are all linked. They begin at one end and hop along each designated post. At the other end the wire joins the designated harness wire. In chassis ground instances I crimped an eyelet to the leading wire and used a self-tapping screw to secure the eyelet to a clean ground on the underside of the dash.