My new 71 Dart and the issues I am finding. Help needed please

Disconnect the battery first then unbolt the steering column from under the dash 3 nuts and lower it down, then unscrew the cluster to move it towards you, reach in from the side to disconnect speedometer, and ammeter wiring nuts. The instrument cluster grounds to the dash for a return path through the cluster mounting screws. This path is probably degraded with corrosion. Lots of guys put a dedicated ground return wire from the cluster diecast housing to the dash frame.