Well they say in the Manual that 96 to 03 most need to have the Extra Power wire for Pontiacs I do not know how true it is but I may write them. Does our car support Oil Pressure I do not think that it does I am going to order 2 other gauges today A manual Boost gauge and an Electric Oil Pressure I think.
No the PCM doesn't have an output for oil pressure that the scan gauge can pick up. My car has an oil pressure guage stock. While I know know the real numbers, I do look at the needle to make sure it's where is supposed to be.