Originally posted by thaveen
translation:
I went to start my car, and i blew out the back-up fuse. Once i had changed it, my radio and my tachomter stay on. The only way for me to turn them off is to take out the back-up fuse. What could have went wrong? keep in mind they stay on with my key (in?) 
lol ahhh i see, now that makes more sense.
You probably changed the "radio and tachometer" fuse(s) and not the back up fuse. Did you replace the blown fuse with the same size fuse i.e. 15,20,25?