hey guys...i wanted to swap in a center tach cluster from an sti into my 02 wrx. what sort of problems will i encounter, such as milage reading, speedo accuracy (kph/mph), does it have to be from an american sti or can i get a jdm unit??? any input is appreciated. thanks in advance craig

 

basically i dont want to void my warranty by screwing up my milage. can i get around that and have a cooler cluster??? and bump