Hey guys I have a 1990 cbr 600 love it plastics are kinda crap but the real reason in posting is to ask if other peoples temp gauges are lit up like the speedo and tach because mine is not but would help if it was

 

Check the bulb, the guages have multiple bulbs in them and best bet is that one is burnt out.
You access them from the rear, usually you'll see some wires with rubber boots around them.
Pull the boot (gently, in case it's not a bulb, remember, I'm not there!) and you should be able to change it.

Good luck, Ern