it's the "Range C" Input to simulate p/n, like you said, to simulate.. It used to work fine.

I'm assuming so..never had to mess with it..I believe is the sensor that is on the transfer case when i swapped in the 4472 transfer case from a 93 astro when i did my awd conversion. Forgive my ignorance.
I do know I used the drac that was paired with the 427 and jumpered the connections matching my gear ratio.