Hi 67SS! Thank you for your feedback
I'm going to check the site tomorrow, now that I know what kind of part I'm looking for, it was awesome to find it on ebay (until you sent me that, I didn't actually know the correct word in english and I couldn't find it!!) for around 14 dollars. I'll try to see if I can get a hand from a friend of mine to confirm it's a different speedometer gear, if that's the case, I think I can spend 30 dollars on the spare part and bet the customs will let it pass.
I saw an electronic adapter on the website you sent me. Since it's 369 dollars, I'm going to keep it in mind for a later trip to the US. The former owner of the car said it was measuring around 40% higher than what it should be, but I still have to find a place to do the testing with the gps. I think this weekend I'll be able to do that too
As for the steering wheel, I'm not sure if it's the original or not, but I believe it is. I'll upload a picture tomorrow so we can check
I haven't been able to take it apart because it's stuck. I'm trying to find a tool that I saw online to remove the wheel without breaking anything. I wanted to take it apart to fix the left and right flashers (they don't go back when you turn the wheel and I found two pieces that might have gotten loose causing the problem) but until I get that tool, I don't want to risk ruin anything :S
I don't want to be lazy or anything close to it, but do you know where could the ground in the tank be? I've also been trying to find out where the gauge is but I honestly didn't have any time yet to take a look in the manuals I found online (also my computer is rather old and heavy pdfs tend to kill it hahahahahha!).
Thank you all for the help, it means a lot