how difficult is it to pull the gauge (instrument) cluster to check the bulb?
also, the backlighting for the climate control just went out a week ago, so I presumably could also diagnose and fix that while I'm in there...?
ETA: the 4Runner has HID headlights conversion, in case that makes a difference in any of your responses in how I can diagnose and fix the (blue) indicating light for the high beams...