Where can I get the Seat 127 Fura manual?

The needle of the temperature of my car was fine when I bought it, about two months ago I noticed that it no longer marked, at times it worked and then fell again, but I had not dared to touch it. A few days ago I decided and bought the thermos contact of the butt (that told me a neighbor who spends her cars) was easy and not very expensive. The problem is that it remains the same, it makes the attempt but nothing, only if I play the thread with the cable. Is it a sensor and not that piece that fails? Or will it be dirty and that's why they don't hit? I have looked for my car's manual to make sure everything should go, but I haven't had luck.