You rang, my lord
I can tell what i did:
I placed a complete gsxr-1000 unit in a EFE housing.
Got the speedo to work by using GSXR1000 speed sensor. The gsxr1000 uses a castellated nut.
Because my EFE had an outrigger i could not use a castellated nu. Instead I welded 5 nuts on the front sprocket. In those nuts i put bolts to get the same effect.
Had to use a speedohealer to get the speed spot on.