Just curious, how did you go about replace your tail lamps with LED's. As far as the 'tail lamp out' light, the easiest thing to do would probably be to check the resistance of the OE bulb, then check the resistance of the LED assembly, and increase the resistance to that of OE. However, this may dim the whole assembly, so it may not be worth it.
As far as replacing the rest of the lights, there is a write up on how to do the gauges and radio lights on Gen 2's (and 1's?) The radio lights in Gen 3's are unservicable I believe. The inside lights could be a little tricky, but a little creative thinking should provide a plan. Good luck and please, post pictures!
~~Maverick~~