Dave it is Autobest F4027. The output pressure on mine is 2.5 to 3.2 psi. You can see it on Amazon (for one source). Autobest from what I've read began in China around 1994 and since 2007 has been in the USA.
Curious… did you wire it through some sort of safety switch?
(I think an oil pressure switch is one way people do this).
