1971 Dart Swinger Gauge upgrade

DartGTDan said

You could buy a used '72-up dash frame, that would accommodate that insert, and fill it with the gauges you want.

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That would an option but the heater control and the hole for it changed in 73. Mine had a wood grain dash which I decided I didn't want. I use a 71 Duster frame for mine.
70-72 Duster and 72 Dart share the same frame.