I've had all thise things happen to my bike, from the light blowing, all of them went at different times, and the speedo cable makes a resonating in the gauge cluster which above 35/40mph squeeks horribly. Taken it to the shop several times, they always do something and say its fixed but it never is. To diagnose the cluster, when it makes the noise tap the gauge firmly and if the pitch changes with the tap it's coming from there.
Read my blog on this site, and watch this video.
Noise at about 30 sec mark.
Link to original page on YouTube.