Oil pressure switch/sender

[stedale]

A really simple question that has probably been asked a zillion times before (I searched but could not find):

How do you test a Oil low-pressure switch that you suspect to be duff? All I know is the oil light doesn't light on startup and it's not the bulb that is broken.

Thanks in advance,

Steve.

[stedale]

Excellent, thanks for your reply - it seems obvious to me now it's been explained!

Cheers,

Steve.