Cadillac Eldorado Instrument Cluster Not Working

Dash Was Lit But Speedometer, Tachometer, Digital Information, Nothing Worked. Removed Battery Terminals Grounded Them Out For A Few Minutes...

After Having The Heads Replaced By A Mechanic, None Of The Bells Or Lights Come On When The Ignition Is On Except For Check Engine.and Then...

When Starting The Car, The Instrument Cluster Will Not Come On. This Includes The Entire Information Center With The Climate Controls As...