I disassembled the instrument cluster to start cleaning 45 years of dirt away. The gauges seem to be in good shape. The metal housing is a little rusted so I used a chemical liquid rust remover that leaves a zinc coating.
It works fairly well as long as you work it good. The last two pictures are after the treatment. I need to test the fuel gauge to see if it is working good. I would also like to set the mileage to 0 to start fresh after the restoration.