I was wondering if I could just remove my old tach, that goes up to 8000rpm and redlines at 5000rpm, and put in a 92 Integra Tach. If i just wired it in would it work or would it be completely out of whack? Pretty much what I'm wondering is: Does the ECU tell the needle how much to move, or does it just tell it how many RMP to display? So would any tach wired to that ECU have to be recalibrated, or will it be ok? Thanks.