I want to wire my gen to start from the pressure tank switch. I have 2 wire auto start. Start gen the gen starts 12 v timer switch wait 20 s for gen to get up to speed then open relays for house and we’ll power. Can’t figure out how to turn power off before gen turns off. I’m thinking 12 volt relay when we’ll tank switch turns off then another timer before gen turns off. Can’t figure out how to wire though. Any help?