Can't do much with the Autometer gauges. I have drilled holes in one 67 plastic dash gauge assembly, and it didn't look good. So, I had new vintage make me a custom setup. I have all the warning lights now, turn signals, etc.
I bought the 3-in-1 kit, but it is called the 68 series. The cost for that kit is $629.95 in their store. Gives you 6 gauges in the dash.
http://www.newvintageusa.com/1968.html
Mine was custom, but it looks similar to their prototype setup on the 68 series. If you want something different, then get a custom kit. Different colors, etc. That is your best option for gauges.
Jeff
If you decide to buy LED's be sure they are eye safe. Most are not eye safe. A friend of mine works at AFRL for USAF, and they had problems with LED's causing glare.