problem

[LightningGSX]

I believe you can, but the pulses will be inverted.It would let you know if thats the problem though.I'm about 95% sure its your CAS or the CAS's wiring.The easiest thing to do would be to take a multimeter, set it to AC, put the positive lead on the RPM wire of the AFC(or the CAS wire), ground the negative lead and check for voltage during cranking.