Make sure the fuse that controls that circuit hasn't blown out. If not, it's possilbe that the dimmer switch may have become faulty or the wires leading to or from it may have become loose or unplugged. The other possibility is, given the age of the vehicle, the bulbs may simply have all burnt out.
To locate the dash lights fuse on a 1999 Honda Accord to find out if it is causing the dash lights do not work when you have the parking lights on after installing an after-market radio, check the owner's manual. You can also find a fuse diagram at most auto part stores.
replacing dash board lights
Check the fuse for parking/tailights (dash lights also on this circuit)
dash lights looks like an engine
green
Look Under The Dash
replace fuse
The dash lights on a vehicle are there to let the driver know what is going on with the vehicle. Most lights are self explanatory if they are not the Manuel will have a diagram.
dash light location on a 1999 hound accord V6
bad cluster
2008 Honda civic exl I have a dash warning light tpml
www.honda_tech.com