How big is your tank and what type of tank is it?
Is your water pump pressure activated i.e is your pipe permanently pressurised?
Why do you need two psi pressure sensors?
I see that the psi pressure and flow sensors are 5v ADC and assume you will also need ADS115
The following is code for the ADS1115. GND needs to be same between the node and the ADS. And you will also need a good solid 5v supply for the flow, pressure sensors and ADS1115. The wiring diagrams are on the link you posted
Edit: I just saw my my code is above