Installed in my 1973 XR-7. It comes with instructions which I needed. I plugged them in but didn't work and the instructions advise that if this happens you need to reverse the wires (polarity) at you plug or fabricate 2" jumper cables. I opted to make the jumper cables because my connectors didn't extend long enough for me to easily work on removing the wires from the connector plus I didn't want to damage my connector. To fabricate jumper cables just obtain (4) male and female 1/4" disconnects and (4) 2" length of 16 gauge wire. Crimp the wires to the disconnects and you will have 4 jumper cables. Once done they easily tuck away under the dash and hidden behind the glove box. Note: My emergency flasher was located to the right of the radio and the turn signal was under the right side of the glove box. Both easily accessible once the glove box was removed.