Might be a problem with the dimmer or connector on back of cluster

Pull the dimmer switch out of the dash. Unplug the 3-pin plug that's connected to the dimmer.
take a wire to insert into the back of the plug and short the black wire to the red wire.
turn on the parklamps (position I)

If the dash lights turn on try plugging the plug back into the dimmer. (checking for bad connection)
If the lights remain off then replace the dimmer.
If not then you have a wiring issue or the bulbs need replacing. My .02__________________