Safe to splice the power wires going to a E-450 fuel pump?

The main reason for this theft deterrent is that the vehicle doesn't have a PATS system. So, it is pretty easy for a thief to break out the ignition lock. Anything is better than nothing in this case.

Here is what I'd use for a key switch:



I am going to look at something for the starter. That way, if I totally hose up the splice, the vehicle doesn't start, as opposed to the risk of it shutting down on the road.