um...
you can use nail polish remover...
but be careful to not take away the plastic it's made out of...
and isn't the LED behind the needle white already?
If so, you don't need to paint them..and if you want to...paint the LED or light that's behind it...don't paint the needle, it won't look clean...
there is a way of doing this here.
http://www.lvcm.com/seanyiya/public/led_store/http://www.lvcm.com/seanyiya/public/led/install/