Mercury - Caution Decal (Multiple Engines) Safety & Operation Label Marine Adhesive Vinyl 8M0161427. Overview. Anyone who's spent time running a multi-engine boat knows there's a rhythm to it - a balance between power, control, and awareness. When you're backing away from a dock or easing into shallow water with several outboards behind you, clear reminders make a difference. The Mercury 8M0161427 Caution Decal may be small, but it plays a role every boater appreciates: helping you stay mindful