fun way to use LEDS?

Here is a set of generic Summit Racing digital gauges. The only gauge where you may need to have some sort of adapter to connect is the speedometer and they are available from the manufacturers of the gauges. Tach, oil, temp, voltage are all generic and these look like your orignal post.

You will certainly need to get creative to make a bezel but there are a couple of companies out there that make dash bezels for A-bodies that you could mount these gauges in.