In 87 gta has a digital dash. I want to know some things, what should shown in the small square at the upper left corner of the tachometer display; in the midle of the dash board appears another display that shows the odometer, a miles that you had trip and the opcion to use m/h or k/h, but it only shows that info for short seconds then blackoff. Does any body has an idea how I can solve this problems or anyone has the wiring diagram of does.

 

i kno that the small square is for a shift indicator. only works if u have a standard