Tom Gardner wrote:
I want to sense pressure in a line that feeds part clamps and turn on a
green light and/or have a red light go out so the operator will try to
remember to clamp the parts.
(...)

Three bucks for a 100 PSI brake light switch. Only 911 are left.
http://www.surpluscenter.com/item.as...-2400&catname=

--Winston