In Need of a Battery Cut Off Switch Diagram

Loking for help on putting in a cut off switch for my dart I am a electrical dummy What cable how much and connectors will I need and what size I know Im asking for alot but if you have the time please advise . If your in the area I will pay to install or maybe you know someone or a shop that will in my area

I have the switch Brand: MOROSO
Our Part Number: M2874101

Thanks Tommy
Chicago IL