On Friday, August 14, 2020 at 9:38:59 AM UTC-4, Ron D. wrote:
Comments:

1. use a definite purpose contactor.

2. the pressure switch might have a minimum load, so if those contacts are used to switch a relay coil, they may fail.
http://store.flw.com/content/100608/...ure-switch.pdf

I also think that putting the pressure switch next to the well-head is a good idea. The tank really does not care where it is in the system.

Peter Wieck
Melrose Park, PA