5940 x 1. THIS IS A NEW REV. COUNTER TACHOMETER CABLE FOR EARLIER SPEC. XK150 MODELS WITH THE MECHANICAL DRIVE (FROM THE 90° ANGLE DRIVE BOX ON THE CAM). THE LENGTH OF THIS CABLE IS APPROX 1" LONGER ( 17" ) THAN ORIGINAL AS WE FIND THIS WORKS FAR BETTER DUE TO THE CAMSHAFT ANGLE DRIVE BOX'S UNIQUE ORIENTATION. THE ANGLE DRIVE HAS 1/8" SQUARE DRIVE SOCKET AS DOES THE  GAUGE INPUT DRIVE. THERE IS ONLY ONE TYPE FOR THE XK150 AS LATER MODELS GO TO AN ELECTRONIC TACHOMETER DRIVE . MAKE SURE YOU FIT THE CABLE  WITH NO SHARP BENDS OR LOOPS IN IT - OR BE WARNED, IT MAY FAIL PREMATURELY .

This early drive is mechanical and drives the angle drive box, SEE : 8523 which sits on an rotatong adaptor plate  SEE :  8523A  and then drives the 17" mechanical cable at the correct angle.