Hiding the wires in engine bay

Not hidden, but clean and simple is to run engine bay wires inside smooth PVC wiring sheath, like I did. Easier to keep clean than split loom and looks slick. It is kind of like heat shrink, but doesn't shrink. Look for "PVC-105", as I recall, made by Alpha or SPC. Mercedes used similar in my 85 300D, for both wires and vacuum tubing.