I would go to Speedway and get an oil pressure fuel pump control switch at least (about $30.00). A pretty good patch for a deficient cut down job. You will have to watch it because when the motor gets hot and oil press drops the fuel pump will cut off at idle speeds I guess one reason some of them guys come through the pits reving their motors. Some people also use a by pass switch to by pass the pressure switch, but it should be a momentary switch so dumbness does not over ride safety.

Honest Dad himself