Thanks for all your suggestions. I now have some LEDs that I'm going to experiment with them.

I took the cluster out and noticed that the prisms have been melted at the very end and have a darkened appearance. It's too late not, but I've got to ask. Is the 194 lamp a 3 watt or 5 watt lamp? I've had 194s in there for years.

Can the prisms be cleaned or even have the melted, opaque end carefully cut off, this exposing clear material to the light?

1983/300CD, When you talk about the bright aluminum tape, do you mean to place it between the prism and the white replective cover?

Finally, does anyone know of a company out there that refurbishes these instrument cluster housings?