ok, so i finally got my new clutch, flywheel and axles in after about 8 hrs. of work (it was mine and my g/f's dad's first time doing this). everything is fine except the speedometer doesn't work. we know we plugged it back in the transmission so it should work but it doesn't. the only thing i can think of is that when i washed my tranny off (it was covered in shitty axle grease) that the plug in the tranny got wet and that's why it doesn't work. i was thinking that maybe it would dry out and start working after a couple days but i hope it's not ruined. also, after about 10 minutes of driving, my check engine light came on so i'm supposing it's a damn emission thing. is there any possible way a non-working speedo could set it off? hopefully you guys can shed some light on the situation.