Mercury - Spark Plug Wire Set EFI FourStroke Series Marine-Grade Ignition Leads 8M0088014. Overview. There's a certain feeling you get when your outboard lights off instantly - a clean, confident rumble that tells you the ignition system is doing exactly what it should. When you rely on your boat to carry you through long days on the water, those small but essential pieces become a quiet source of trust. The Mercury 8M0088014 Spark Plug Wires are the kind of parts that keep that trust alive. The