what about a LED dot matrix module,
either built from individual LEDs, or a ready-made module, together with a PIC?
for instance the 16f884 would be powerful enough, and it also has A/D channels.
I do not know the type of visual impression you are looking for, maybe just a small dot matrix, or LED chains like in the picture, covering the whole front plate. a small (green) 5x7 LED dot matrix would be very decent.
do you need to know exact current? maybe also add a small 8x2 LCD.