Dashboard lights aren't working

Sounds like the switch might be the issue?

You don't indicate what kind of vehicle you have but my guess is you have a cross feed between the dash light circuit and the ignition circuit. You'll probably have to isolate these two circuits (not an easy task).

i know this sounds crazy, but do you have break/tail lights?some cars shut off dash lites when tail/brake lights dont work

You aren't alone with your lights problem . Mu '59 Picanto did exactly the same thing last night. No dashboard, heater, or air vent illumination and worse still no rear lights (note brake lights do work). Got home switched off everything, then switched back on and all working. Very strange.

Did you check your fuses.

You may want to check to see if you have a "gauges" fuse on the fuse panel. Another possibility is the cigarette lighter fuse. Sometimes they're wired on the same circuit.

Hope this helps! :)

go to an accredited auto electrician for electrical work
it may be a switch problem but I think that there is no power to the light relays ( switch or fuses)
if that model has a light control module , it could be that

Stop replacing things and turn off your hazard lights. If this doesn't fix you may have to replace your steering column turn signal switch. Youer hazard lights aren't working likely to a blown fuse.

The brake lights as well as all the others run threw the turn signal switch . replace this and it will solve your problem.

replace the headlight switch