backup lights

Hey there, I'm trying to decipher which wire goes where on my TH400 trans. I have a new harness and have been watching tutorials on how to measure which pins show an open circuit and a closed circuit by testing continuity. However, I still feel like I am missing important information...

Hi guys and gals, I just installed a B&M Sport automatic shifter in my 55 and can't get the back up lights to work. Theres two plug ins on the shifter switch, inner for neutral safety and outer for the backup lights. With a test light the inner safety switch has power with ignition on (but don't...