MPFI and Jumper Harness Question

Hey there, new to g2ic. I have a 91 EF base model. D15b2 dpfi 4spd. Getting ready to swap a b18a1 and ls tranny. And eventually boost. ANYWAYS… If i use this jumper harness http://www.hamotorsports.com/dpfi-obd0-obd1-ecu-jumper.html do i just run a few wires off the harness to my extra injectors? What im asking is, with this harness am i gonna have to hack up my original harness to convert to mpfi? Thanks