During a 700 mile trip this weekend I noticed that the backlight for my speedometer had gone out. The backlight for the tach is still fine, although I made a mental note to replace it at the same time just to save having to go through the process a second time soon. I'm looking at the Honda Service Manual (for 92-95 ST1100A) and Section 21-4 refers to "Indicator Bulb Replacement". This has me scratching my head because it indicates (pardon the pun) there is only one. But the backlight for the tach/right side is fine...it's just the speedo/left side that has gone out. I can start taking things apart and probably sort it out but I'm hoping someone has already been there and done that and can save me a few minutes or more. Are there in fact two light bulbs or is something else causing half the panel to go dark?