A tank full of light emiting liquid (ex. lava) should set all iron tank gauge blocks light levels to the liquids light lvl - 1

Spammy and buggy in my experience.
I look forward to where this issue goes, because I tried to get this working in OpenBlocks, it's not fun, and then you've gotta set a minimum light level anyway if you want it to be changing.

Shouldn't be to bad, should just be able to check the TE data for the liquids light level and determine if the liquid's level has reached a point to effect the block.

Perhaps just a little bit of code so it only checks every 50 ticks or so?

I would really like illuminated tanks like this, though. =)

Fairly simple change, no different from the Blast Furnace and Coke Oven which emit light, but I can see much lag potential if the tank is sucking fumes.