Gearhead6s

i bought an M6 tranny so that i could totally remove my factory PCM and run nothing but the FAST. i have the FAST hooked up to rn the auto that was in my car but that caused too many problems. so now that i have gone through all the connections to my PCM and remeoved the rest of them that i don't need for the M6 i am left with the yellow 3x wire. the pin out for the PCM calls it the "REF 3x" (C1 pin 1) that runs to the crank position sensor. question is, is there a way to get this signal with out the PCM? is it needed with FAST?