With the engine off, jump 12V to the clutch and see if it clicks. If it does not, check the clutch coil with an ohmmeter and see if the coil is open. If the coil is not open and it is still not clicking in, then check the air gap.

If the clutch kicks in when jumping 12V to it, then you need to see if the low pressure switch is making contact. Use your ohmmeter to check it.

Good luck and let us know the outcome of these tests. I believe that these tests should be done before worrying about the rotation sensor.

Good luck,