Look at the rotor and click the key to see which way it spins. The firing order is 1-5-3-6-2-4. Leave the cap off. Take out the #1 spark plug and install a compression gauge, or better yet, stick your finger in the hole. Carefully, and not air tight. Click the key over to start, and release it as quick as you can. When the gauge moves it is coming up on compression #1. Look at which lug in the cap the rotor is pointing at. Install #1 plug wire and circle around with the rest of them.