difficult tech question '01 dakota

i'm planning on installing a clifford matrix rsx 3.5 into a 2001 dodge dakota r/t 5.9L.  using this forum i found the wire schedule at http://directechs.com/directwire/wire_body.asp?action=select&yr=3233&product=Security  but what my question is, has to do with the door locks.  if you notice, it has a note saying:

so how am i to hook up a standard after market alarm to one wire with resistors???

and also, any comments on the matrix rsx 3.5?  good places to buy? 

thanks for all the help!