Can someone help with this idea?

I'd like to set up a small DIY water too off system. My schematic can be seen below as well as the parts I'd like to use. I've received a little bit of conflicting advise on another forum if the board will work or not. Specifically "The schematic does not show a voltage regulator from 12 Volts to 5 Volts. There is a P9 mentioned in the schematic with separate 5 Volts and 12 Volts pins."

Original thread here https://forum.allaboutcircuits.com/threads/will-these-components-work-together.183378/#post-1686475

Wonderd said:

I'd like to set up a small DIY water too off system.

Click to expand...

I've no idea what that means. What are you trying to do?

Mike.

Sorry it should be "water top off system" when water gets certain level, trigger activates the pump and it pumps water until trigger goes to full position.

I'm inclined to think this will work - assuming those relay board inputs are actually active low. Don't see why anyone was worrying about a 5v regulator.
I would test to ensure the relays click when activated, and that the contact terminals behave as expected, before wiring up.