i am about 99% positive a 05 hemi ram gets vehicle speed from the rear sensor and it sends it to the anti lock brake module (pretty sure it is a digital signal) then on a dedicated circuit it goes from the anti lock module to the PCM (8000 pulse per mile). the pcm sends out 5v and the brake module pulses it to ground to represent the 8k pulse. dakota digital makes a signal converter, but i am not sure it is going to work. i am in the process of working on the cruise for my car right now.

good luck sounds like a neat conversion

justin