Hey I have an 2005 lq4 from a gmc 2500hd, they didn't give me the tac module to begin with. I called back the same guy and told him I was missing the tac module and mass air s ensor, so I picked up the box today and there are two tac modules in it 12573059 and 12588923, after a search on the internet I found the 059 is for 03-05's and the 923 is 05+. which one do I use?
Thanks,
Danny
