Can't say for sure on full size cars but anything 1969 and newer in the Pontiac A body series cars, you have to first remove the dash pad and gauges as and assembly then very carefully place your dash-pad face down on top of the workbench; first covered with some carpet and/or padding.
Then remove the screws that hold the gauge cluster into the backside of the pad. Most likely Big cars would be similar in 1970.
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Peter Serio
Owner, Precision Pontiac
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