Auto Meter gauges in the factory bezel?

[harshard]

I have a question on how to replace the factory gauges on my '71 with auto meter gauges using the factory bezel. I have seen pictures of this done but do not know what size gauge or weather or not the bezel had to be cut. There is very little room between gauge openings, therefore gauge size would be criticle. If any one here has done this and can remember what size gauges to use please let me know. Thanks, Shawn