need advice on removing the dash to access the ignition cylinder on my 420sel
 

Heya everyone still having my ignition problem, found a mickey moused after market alarm i need to trace the wires back to the ignition to remove it and resplice the wires, i was told to access the ignition from behind the cluster ? any instructions on how to remove the cluster and get to the ignition cylinder , help :) thanks
1988 420sel