I think there's some sort of blue layer in there. The regular incandescent bulbs have a yellowish hue and the symbols show up greenish, if a white LED bulb is used the symbols look blue.
Do as suggested above but also check voltage at the battery, if low charge the battery then check voltage at the battery while the engine is running, should be around 14.5 volts if not your alternator is bad.
Also add your truck specs to your signature.