Slant 6 pushbutton to 3 speed swap

I just swapped out a pushbutton tranny to a 3-speed and installed a floor shifter. What i would like to know is : There should have been a neutral safety switch in the car but i cant find the wiring for it, can i just change my starter relay and be good-to-go or is there something else i have to do to get it to start with the key? I can start it by jumping out the solenoid and i can start it by jumping out the starter relay. Any help with this would be appreciated.