Tricky04Rado

i have an 05 legacy that im putting a kenwood hu in and i was wondering what to do with the orange illumination wire (-) and orange/white wire (+) coming from the metra 70-8901 adapter my kenwood harness has neither wire in it and i remember having to ground the orange wire wen putting a radio in a 97 legacy becuz i had no gauge lights before but the dimmer for dash lights didnt work i was wondering if anyone came across this before and what i might be able to do