Lights on speedo not working

[Impey]

When I have my lights on the speedo and the rev countor does not light up. Is there a bulb behind the dash that needs changing is so what one do I need

 

[MartinR]

Brightness adjuster next to the CC and ESP buttons??

 

[plymcl172]

FF172 ? really ?

 

[Impey]

Yeah it's a ff172 but has no light adjuster as its a 02 plate. All other clocks are fine tho