My father has an 88 seville coupe and was trying to get trouble codes from the on board diag panel, anyone know what buttons to push. Also reads everything in metric would like to chande back to normal gallons and such

 

With the engine off, turn ignition to the on position,push off and warmer and hold till the diagnostics start up. Jot down any numbers that come up and when the diag. is done 88 should show . To clear codes push off and high and hold.

 

Info on DIC's here.