CRK SENSOR AIR GAP

I'm also working on a Chrysler Sebring with
a no spark condition. It's squawking a code
11-NO CRANK REFERENCE... I've replaced
the distributor which  houses the CAM
sensor which in turn sends a signal to the
CRK SENSOR via  a single lead from the
COIL WINDINGS  In the distributor. It
incorporates an ASR / automatic shutdown
relay. ( which  NOTHING works if  it is not
energized. )    When the CRK SENSOR sends
a signal,  The PCU  applies a ground to the
ASR,  which applies 12vdc to  the injectors,  
the distributor etc. The PCU THEN APPLIES
A LOW  TO THE NEGATIVE SIDE OF THE
COIL WHEN THE CRK SENSOR READS THE
TIMING WINDOWS ON THE CRANK RING . I
think I might understand the concept of it
all,  but what do I need to use to set the air
gap between the CRK SENSOR and the
EXCITER RING ON THE FLYWHEEL. What is
the clearance?