question about pressure switches for oil

I know there are some of us with mechanical skills and knowledge that is other than form our beloved Z cars. Here is what I have a question about . Does any one know of a pressure switch that can be taped into the port of the oil sending unit maby throu using a tee fitting . The object is to have a switch that can be intergrated into the wireing thru a relay that would close when there was oil pressure say of 10 or 15 lbs . When closed current then would flow to the electric fuel pump and start fuel running. This way if there were a oil pump failure the engine would quit before damage would occure , hopefully. More inpotantly if in the case of a crash or a turn over when the engine stopped the fuel would also stop pumping. Gary