Help needed

HI Guy's,

ok just about to fit a new fuel system with an electric pump I have been told I need to fit a safety shut off switch in case of a accident.

I have been able to find 2 different kinds & was wondering what 1 to use

The first 1 is a oil pressure switch which cuts the fuel when the oil pressure drops below 5psi

The second is a electric switch I am not sure which 1 to use.

So my question is what are other racer using ???

Thanks Oz