New Triumph Tachometer Drive Screw Plug. This screw is used to plug the tachometer drive hole when a tachometer drive is not being used. Features a left hand thread with a thread pitch of 20 TPI – made in England. Fits Triumph 500, 650, and 750 twins (TR6, T140, T100, etc) from 1969-1982. Please refer to your parts catalog for proper fitment.*****Check your parts book to ensure the best fitment.*****Made in EnglandO.E.M Part number is 21-1871