I had a post over in the pcm diagnostics section about a few things, and basically everyone said that the only thing that I have to worry about is the speedo being incorrect. They said my tach and rev limiter and all that should still work and be accurate (I hope that's correct!) So i'm curious, for anyone that has done this swap into an LS1, how exactly do I get the speedo to be correct? Thanks for any help guys!

PS - The car is an M6 car.