There ussually is no fuse but replacing the bulb is'nt THAT hard.especially if you have nimble fingers,the clocks can be a bit awkward to get out but the bulbs are pretty easy to replace,just make sure its the correct one,they have different wattages,ussually coloured,its a common fault as i have had 3 with no tacho backlight.
be carefull pulling the clocks once out as the wiring is pretty tight behind,at least there is no speedo cable to contend with lol.