I have a 2003 blazer and a couple years ago i was having the typical chevy related dash issues and the original cluster got broke from a chicks fist so i went to the junk yard grabbed a dash from a 1999 blazer it looked exactly the same i put it in and the gauges work sometimes not all the time i threw the og. One away i thought that i was lookin at getting a bcm what im not sure of is i read that in 2003 the cluster kept the mileage rather than pcm or bcm so does the cluster then communicate diffrently to pcm because im having some engine misses and hard starts and when i put a fuel pump in it the other day the contact for the fuel gauge was pretty chared looking am i needing a 03 dash before i do bcm