It is reading the ring in the back...the ring has different notches and spaces.
option A
if you are good with metal work and you know how to work with a caliper and protractor you could make something for yourself
the easy way is to make to scale a replica of the flexplate which also works mwith notches and spaces, the scale has to be as accurate as possible
that replica could be either a pulley , a wheel or a ring etc
how to do it ?
first you need to know the circumference of the flexplate measured somewhere near the middle of the notches
that circumference is translated to 360 degres
next you measure all the spaces and notches and also translate all that in degres
the sum would be very close to 360
after that you do the reverse
your new diameter is 360 degres
and you translate all your measures from degres to centimer or inches etc
option B
you go to the ASEC board and check the 5 speed swap thread in the high performance section
there is a custom trigger wheel under devellopment that should it production
option C
purely electronic mostly software programmation actually
you build a device that will translate mitsubishi into chrysler
you still know to know in degres the mitsubishi AND the chrysler pattern
you program a micro controller to output the chrysler pattern based on the input of a mitsubishi pattern
getting the right initial timming will demand trial and error
Alain