Need some help please
 

I recently replaced my clutch in my 88 rx7 13b once I was done I found that it is making a weird sound almost like something rattling but I don't think that is what it is . It happens when I am accelerating and it almost sounds as though maybe it is something to do with everytime the flywheel goes around ? Does that make sense? This is the first time I ever done anything like this before. Also I have noticed that my back up lights stay on when I am not in reverse. If anyone could maybe give me some suggestions I would appreciate it . Thank you