20 gauge solid wire, such as aluminum or copper picture hanging wire from the hardware store, is a good fit for the 38 pin sockets. With a flashlight you can see which of the 38 pins have a metal insert - most don't. It's basically 4, 6, 7, 8, 16, 17, 19 and 30 as I recall. Engine problems are on 4, 7, 17 and 19. By the way E320s have more the two pins, it's more like five I believe.