On the driver sides front wheel there is a sensor (really just a wire that goes down to a connector on the brake pad.
It breaks by design when pads need changing. So everytime its time to change pads you have to replace the sensor.
Easiest way? pull the wire off the connector and join the two wires up creating a loop. The lights will go out.
CD stacker is common on any car overtime. Dont bother. Leave everything there for original look. Just buy yourself a bluetooth USB mp3 player off ebay that plugs into the cigarette lighter.
Tacho Speedo. Have you try smacking the dash? The Needles have a lubricant that gets stuck especially when the weather is warm. Cold weather isnt too bad. There is a write up on the internet on how to pull the speedo out and clean the affected needle areas.
http://www.clublexus.com/forums/ls400/225935-how-to-fix-your-speedo-needle-when-it-does-not-work-4.html