If you're looking to improve safety, you should try to keep the fuel in
the tank. It might be better to include a solenoid valve right at the
tank outlet. The solenoid valve would be set up to only open if
electrical power is applied; then you could use either lack of oil
pressure or an inertia cutout switch to disable the fuel flow.
If the float bowl of the carburetor is full of fuel, the engine can run
for a surprising length of time. If you want the engine to shut down
immediately on loss of oil pressure (to keep it from destroying itself)
then you'd want to interlock the oil sender output to the ignition
control in addition to shutting down the fuel pump.
As has been mentioned, increasing the complexity of the controls on the
fuel pump (and ignition) operation increase the chances that you'll be
stuck by the side of the road due to a sender failure. If you want to be
safe and not worry about that kind of thing, you'd best look at plumbing
in redundant sensors. Also... most OEM oil pressure switches that are
used to drive idiot lights come on at 5 to 10 PSI - not enough to safely
keep the car running on.
Theo
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