oil type and oil pump

[fixkick]

the stock switch is a (sorry too late, engine is now damaged) it can be as low as 3psi for the lamp to glow. crazy low.
id use 10.

ok i see now, a higher spec. switch, sure vast switches are sold but need to be BSPT threads
i have a BSPT to NPT adapter "bloody British to Grengo" adaptor. LOL ! NPT is usa tapered threads. National pipe threads
but you'd need to just find the switch and matching adapter if need be.
the lamp glows when the switch closes, it's just like wiring of a flashlight (Torch, in UK)
the switch grounds the lamp at 3psi.
id keep it there, or get higher switch.
some gauges have a light and some buzzer.
there is no engine kill in the ECU, for this switch,its just a warning lamp.

cheers