This car uses a circuit in the oil pressure switch to control the electric fuel pump in the event that there is a loss of oil pressure.
If the car has experienced the sort of electrical load that it blew the fuse, then the fuel pump is failing.
Since you used a higher rated fuse, you defeated the purpose of the fuse, and caused wiring damage to your car.
You can locate a repair harness at either the dealer, or go the wrecking yard and cut out a used one for the oil sender.
As far as the fuel pump, replace it, the fuel strainer AND the fuel filter. Then replace the relay and replace the fuse with the recommended rating. Save the car. The pump, fuse, relay etc are all less expensive than the car, not to mention the cost of a fire that may cause you to lose control and wreck, possibly injuring yourself or someone else.