Hi racer84,
I have never done this before but I think I can give you some idea.
For the first part, install an on/off switch on the power supply wire to the fuel pump for emergency manual shut off. I believe there are special switches that are installed on the bonnet for cars used in racing and rallies.
For the second part, use the oil pressure switch wire as a grounding point to activate a relay to supply power to the fuel pump.