Did a search and found only one thread that came close to answering this question. Maybe I haven't hit the right combo of search words yet. I have a 74 Blazer and when I paint it and then do the interior I was thinking of upgrading the dash to something around 87 or so. I guess I'd have to completely replace all the guages, guage circuit board, etc. Anybody do this? Is the body under the dash the same up until 91? I plan on doing the 91 front clip, fenders, hood, etc.