Where is fuel pump/oil press switch on 93 caprice?

Hi im not gettin any fire to fuel pump, I added a line from the hot wire to the fuel pump and it worked but in the wiring diagram it says that the fuel pump oil pressure switch is next in line, possibly causing it not to fire. In the chevy Haynes Repair Manual its really not giving an accurate position so I don't know where to look exactly. Please help!