These are available on evilbay for $31 posted and cut the power to your fuel pump in an accident, reducing the chance of a fire.
They are easy to wire in, just cut the fuel pump wire and wire it in (ign is power in, pump is power out to pump).
It also has a 3rd terminal (marked W/L) that can be wired to automatically activate the vehicles hazard warning lights.
![Image](https://i.ibb.co/yNhTLj2/collision-safety-switch.png)