They are both the two post type. I can see a little resistor (I think thats what it is at least) on the back of each gauge. I can't find the link to the instructions that I downloaded, but they don't really say much and actually have a diagram of the OEM type gauges on it anyway. These new gauges do have I and S marked however, I just didn't look for that as I was putting them in. The Fuel gauge has two posts, one is S, the other I think is marked I (didn't actually look for marks on this one once it was installed cause it is working). There is a jumper that goes from the I on the fuel to the I on the temp gauge. This is what I had hooked up incorrectly, originally hooked to the S post on the temp gauge. When it was hooked up that way, the temp gauge never did anything, stayed pegged on Cold. Once I got it switched, with a bad temp sender, it pegged hot when turned on. Now that I have a good temp sender in, it still pegs hot when turned on. So now it is unplugged so I don't fry something more than I already have, and gauge is pegged cold, unhooked.
Hope this helps explain. I'll try to take a picture of the back of the speedo when I get home tonight.