I hi all. I buy a grand prix 1989 and i have a little problem with it. Here the trouble.

My grand prix have all electical option avaliable for this year like Speedometer digital, A/C, automatic light, electrical seat , windows etc...... When i start the car or i urn the key on, all it okay but when the night come or when i turnon the light, i lose all my dashboard. I don't see the speedo or the compas and they have no light on me radio. Can anyone help me please.............