I am getting ready to do the remove the dash, replace the header core and air conditioning condenser in my 85 gt, when I noticed my car has an 7000 rpm tach and a 140mph speedometer that look to be original.. the mileage on the odometer shows only 8600 miles so I know that its not original......was this a factory or dealer installed option at some point after the car was built in March 1985. any information would be helpful......thanks
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