Wiring harness help....

I have a 75 Duster and Im replacing the wiring harness. Underdash unit I have is used but in like new condition from a forum member. I need a new engine harness. Ive found one from herbs that says 73+ with module. My question is can you eleminate the module? And if so can I get a 73 non module engine wiring harness and make it work? Its my first module car and Im grasping for straws on this.