41-22 Kill Switch - Opinions?

Has anybody here installed one of these on their fuel pump wiring? I'm not great at electrical, so I was considering it as a reversible solution versus pulling and cutting wires in the cab.

https://41twentytwo.com/install-kill-switch/

 

That looks overly complicated to just adding a kill switch to the starter solenoid wiring. I added a kill switch to the starter wiring but that is not normal. It turned out to be an easy task when I rewired for a dual battery. But, I think I did read a thread on something similar to that fuel relay. Use the search function.

 

I've had this bookmarked for awhile (along with this several other threads), but I'm honestly just not great at reading these kinds of diagrams or doing wiring outside of simple butt splices for 3rd brake lights and the interior fan with a heat gun. If I'm understanding correctly, though, regardless of if I'm doing this DIY or with a kit, I need to be interrupting the C/OPN relay rather than the FPR relay? (Presuming, of course, that this is the same in a 2011 V6 as it is in a 2015 V6.) https://www.tacomaworld.com/threads/2015-fuel-pump-wiring.555303/#post-23807531