That means it's serial data sent over a single (usually purple) wire. That includes all the information for the tach, temperature, fuel level, vehicle speed, and all the other warning lights.
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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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