Also consider wiring to an oil pressure switch.
565 mentioned using an oil pressure switch with the idea being that if there is no oil pressure, then your fuel pump will be shut off.
Don't bother going through this needless complexity. Your carbureted engine can run for quite a while just off the fuel in the float bowls. How do I know? Because on more than one occasion I have hopped in my car, started the engine, and driven away... when I forgot to turn on my electric fuel pump (controlled by a hidden switch). After a couple minutes of run time, the engine starts to sputter and cough as it
finally runs out of fuel. If I had no oil pressure for those two minutes, that would be
plenty of time to cause engine damage, especially if I blissfully assumed there was oil pressure simply because my engine was running. Thus I say don't bother.
As for me, I power my fuel pump from the fuse block as described in this thread. I did put a small inline fuse right next to the fuse block, then ran this (low power) wire to a relay. This voltage activates the relay, which then passes (high power) battery voltage straight to the pump itself. This high-power line also has a fuse right next to the battery, of course.