87123-881-A21 Indication Label - Overview. The 87123-881-A21 Indication Label is an essential component for Honda marine engine systems. This label serves as a critical informational and safety sticker, designed to guide proper use and operation of your equipment. By providing clear indications, it helps prevent misuse and ensures safe operation, thereby supporting the overall reliability and maintenance of your marine engine. Manufactured to match factory specifications, this label integrates s