Battery cut off wiring

Hi, this is my first post here.

I’m trying to wire up a brise ev200 (tyco) electric cut off into a rally car. I’m struggling on the ‘suggested engine cut wiring’ in the first attached diagram (see photo) with regards to how the relay has been wired and why connector 85 is not going to earth but bridged to connector 87.

Also, I’ve enclosed my hand drawn wiring diagram including Ecu and other engine components for you to give me pointers of if it would work, disconnect the power and stop the engine.

Any help would be much appreciated. Thanks