I can run with that I think. By using a relay like this (https://www.amazon.com/Auto-Truck-Relay-Socket-SPDT/dp/B007JPPQH6) I should be able to tie the 12v that starts the pump to the contacts 30(+) and 85(-), wires to the sensor to 85(-) and 87(+), and connect the 30(+) to 86(+) to trigger.