After about a week it started dancing around again, so I resoldered it again. I must have stuffed it up because the needle moves really slowly, like hit the rev limiter and it's climbing through 3k on the dial. Fed up with it now, going to replace the whole thing. Not going to buy a new cluster as it will probably start doing it as well, just going to rip out the tacho and stuff an aftermarket one in there. Went to order one online and realised I have no idea how big the dial is, I'm currently interstate and my car is getting some minor things fixed and a dyno tune done, so I can't measure it up. Does anyone know how big the hole in the surround is that the tacho pokes through? Can't find anything online.