Tail lights out as well as dash lights. 1995 pontiac bonneville

You need a head light switch. buy from carquest (significantly less expensive then dealership).
remove knobs (small insert on pull knob press in with a small flathead while pulling towards you, twilight knob pops right off)

take off the cover plate over steering wheel (pop out with flat head screwdriver)

then cover over instruments (small torx bit 5 screws, 2 hidden by previously removed cover).

three small bolts hold in light switch.

http://www.compnine.com/largeimg/9410173C10-017.gif

may help in clarification

Sounds to me like you have a short in your electrical system. Let me guess, you had an aftermarket stereo installed and then unistalled. then you had some wires exposed inside the dash. You could've grounded out somewhere in there. check and make sure no wires are exposed or touching any metal. If this problem goes unrepaired for a period of time, it could start a chain reaction of shorts in your fusible links. when your dash lights go out it's an indicator that your tail lights are out.