I SwearItsSlow

Hey everybody. If you saw my post in the new member area, you know I just got my dads 96' GT a few days ago. I'm extremely excited, but for awhile the oil pressure in the car is somewhat low and sometimes extremely low. So my dad said the oil pump is going and will be ridiculous to replace because of labor cost. Does anyone have any ideas of how bad it is to have a new one installed? Im not looking for an exact answer, just an estimate. Thank ya much.