Subject: 1992 mitsubishi diamante
Question:

i am trying to install a head unit in my car. can you tell me the original head unit wiring colors for this model.

Answer: Ryan,
Unfortunately, that information is beyond what I can answer. I would highly recommend you get a service manual for your car; and the factory service manual would be the best for verifying wiring colors. Sorry I couldn't be more help.
Good luck!