[edman87]

The tach is identical in size to the gas gauge that came out, used 2 of the same mount holes. The bezel circle does crowd it a little bit and the angle is not a good one. The print on the tach plate is larger taround than the speedo and such because it was not recessed nearly as much in the camaro.
As to the odo, it was pretty easy, but hard to explain, you really just take it apart far enough to get the number reel out and move the keeper on the end of the rod enough to make a small gap between the reels, then move them around to where you want them and push the keeper back to where it was and re-assemble.
Thanks for the comments, if I xcan just find the time to put the blazer back together enough to drive so I can look at the gauges, I will be fine.