No tail lights or dash lights on 1999 Chevrolet 3500 Pickup

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All other lights function properly,turn signals, brake, headlights, reverse , hazards etc.
Lights on the dash itself illuminate , but the lights illuminating the speedometer and such do not.
Ive looked for a blown fuse but havent found one.
I have had a cd player installed recently but cant be sure if the lights failed at the same time.
(1) Answer
On your 1999 Chevrolet 3500 Pickup, the same fuse feeds the tail (park) lights and the dimmable dash lights. That fuse should be located in the instrument panel fuse box, on the left hand edge of the instrument panel. It is a 20A fuse labeled PARK LPS.