The Billet Speedometer Port Blockoff Assembly TRA-20088A provides a secure, leak-free solution for sealing the mechanical speedometer port on TREMEC TKX, TKO, 3550, T-45, T-5, T-56, and T-56 Magnum transmissions. Precision-machined from billet aluminum, this speedo blockoff plug includes an O-ring, bolt, and lock washer to ensure a tight seal and prevent fluid leaks. Perfect for electronic speedometer setups, transmission swaps, and Silver Sport Transmissions applications, this durable blockoff plate delivers reliable performance and a clean, professional finish.