Aeroflow Performance brings you this billet aluminum speedometer delete plug that fits all Tremec T-5, TKO and Magnum manual transmissions, Borg Warner T-45 manual transmissions and Ford C4, C6, AOD automatic transmissions. This plug is used to block the mechanical speedometer gear port when upgrading to an electronic speedometer. By using this delete plug, the transmission will be sealed correctly and not allow dirt or debris to contaminate the transmission internals.