Try toothpaste on the guage lens before you toss it. Seriously, wash it with soapy water first, then polish it with toothpaste on a terry towel.
I know plastic polishes are available, but toothpaste will work in a pinch.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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