According to Gary Slusser :
"Nick Hull" wrote .
In article ,
(wahzoo) wrote:

Does it really matter at what height the pressure switch is mounted?

Mount it at any height. The higher the height, the higher the pressure,
1/2 pound/ft

Actually this doesn't apply here but... the higher the height of the gauge,
the LOWER the pressure, by .433#/ft. No?

Yes.

_Both_ are true ;-)

The actual pressure at any point in the system will be .45 PSI[+] higher for
every foot you raise the pressure switch.

The pressure _seen_ by the gauge will be about .45 PSI lower for every foot
you raise the gauge.

It's called "frame of reference" ;-)

[+] 33 foot head of water is 15PSI. One foot of head is 15/33 = .45 PSI.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.