14221-ZVP-000 Tdc Pulser Plate - Overview. The 14221-ZVP-000 TDC Pulser Plate is an essential component within the ignition system of Honda marine engines. Its primary function is to detect the Top Dead Center (TDC) position of the piston, providing critical timing data to the ignition system. This precise timing enables accurate fuel injection and spark control, ensuring your engine operates reliably and efficiently. Designed as a genuine Honda OEM part, this pulser plate guarantees seamless in