1 x 8520 Rev Counter Drive Assembly. Our own high quality, complete XK120 & XK140 new Rev Counter Adaptor assembly that features the inner drive dog / adaptor shaft (C2176) which bolts into the end of the EXHAUST CAMSHAFT threaded hole. (Back of right hand side bank looking from the front). The aluminium outer body (C2153/1) with fitted seals bolts to the engine block. Front inner oil seal (8521) is  fitted and outer 'O'-ring (8520C) to head included, which just slides over body to seal outlet to block & cam cover. Original Ref. Number C2153/1 .  C2176.

NOTE : Remember to fit an oil thrower plate behind the cam. SEE : 8514

For all other correct Rev. Counter Parts see: XK120 & XK140 Rev Counter Parts

NOTE : This is the correct drive to suit the XK120 & XK140 design of Rev. Counter that (unusually) operates the pointer in an anti-clockwise direction as standard and is simple to convert later engines back to this spec to suit XK120 & XK140 Tachometers.