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They haven't been adjustable since around '88 on the 60°V6. The ones on our cars just self zero every time you turn it on.
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Cliff Scott
2004 Alero GX w/sport pkg - Sold, living somewhere in WI now.
2011 Saab 9-5 Turbo4 M6
2004 Corvette Convertible M6
1994 Chevy Beretta - Quad4/M5
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