How to make a gauge change colour and illuminate?

Hi! Yesterday I merged the weather radar Wx500 with PMDG 737, it works fine but there is a problem with the gauge on the radio stack.After the merge, a gauge controlling the weather radar was added to the radio stack. When it's getting close to the sunset the part of the radio stack where the gauge was added does not change colour together with all other parts and neither does it illuminate during the night. Does someone know how to fix the problem?I've just spent like 2 hours looking for a thread that could help me but without any satisfying results, thus I would be very grateful for your help.