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The battery has to be secured by something other than a cloth strap or factory style J hooks. It can be bolted down in a box or bolted to the floor by metal straps. Most use mounting kits consisting of a plate with threaded rods that hold a top plate over the battery. Think Jegs, Summit or Budget Fabrication aka DYI.

The battery cut-off should interrupt the main power circuit to the car so that throwing it kills the engine and all accessories especially the fuel pump.

Battery positive connects to one pole and the line to the car connects to the other. Most of them can be rotated so that they can be mounted upside down if needed. It's just a gate switch and does not really have a battery side that matters. Just wire it so that Push is Off.

The charge wire from that alternator is not connected to the kill switch. This caused me a problem with the alternator draining the battery with the car off so I put a breaker switch in the alternator line in the cabin. It lets me shut off the feed from the alternator when the car is off. I wired my volt meter directly to this breaker. With the car running and the alternator set to charge the gauge tells me battery power. If I throw the switch and break the charge circuit it tells me the alternator output.

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