The contacts are in the safety switch. I don't have pictures and I tossed the bad switch long ago. But I did find pictures of a 350z safety switch. It looks the same as the 370z switch. Be careful opening it, the tabs are very fragile. I broke one while taking it apart. Glued it back on. Once apart I used some rubbing alcohol on a q-tip to clean the contacts.
Clutch Safety Switch-Cleaning & Adjust - MY350Z.COM Forums