Radio Panel Questions

Since school will be over in the next week, I'm going to have some time to get back to working on my controller, and one of the only things I really want to do but can't quite figure out how to do is to make some sort of switch or rotary that lets me change radio and nav frequencies and OBS setting if possible. I'm using the BU0836A for this, so if anyone knows a way to do this in FSX, I would be extremely grateful. 
Also, if anyone can give any tips on how to wire some LEDs to a battery to make some battery powered panel lights, I would appreciate it as well. Is it as simple as this:
http://en.wikipedia.org/wiki/LED_circuit
Now, if I want to use multiple diodes, how would I change the formula for the LED and resistor combination in parallel? Or can I just put multiple LEDs in series with the same resistor I would use with a single LED? Is there a non-ideal LED voltage drop I have to include that will have more of an effect with more LEDs?
Thanks for any help.

Also, if anyone can give any tips on how to wire some LEDs to a battery to make some battery powered panel lights, I would appreciate it as well. Is it as simple as this:
http://en.wikipedia.org/wiki/LED_circuit
Now, if I want to use multiple diodes, how would I change the formula for the LED and resistor combination in parallel? Or can I just put multiple LEDs in series with the same resistor I would use with a single LED? Is there a non-ideal LED voltage drop I have to include that will have more of an effect with more LEDs?
Thanks for any help.
