Making some progress:
Managed to fix the headlight switch illumination issue... ended up using amber LED's with the factory bulb condoms for the backlights. The traction control button is a little extra bright with the LED I used but no biggie - currently this button is unused as my car is a 91 but I figure it may come in handy to have an extra button some day.
Center console devices are working great.
The stereo still has some alternator whine, I think the filter helped a little. I'm just going to live with it for the time being, lost enough of the driving season already.