Spit,MK3 oil pressure light switch

[Velocita Rosso]

My oil light has just stopped working....bulb OK and new wiring harness

Am I correct in saying that if I continuity test across the switch body and terminal and it  buzzes, then the switch is faulty?

The ball valve inside moves by inserting a probe...but it could be worn

[yorkshire_spam]

Switch should conduct when below the pressure threshold and not conduct when above.
(ie. ON at low/no pressure, OFF at higher pressure) 

(I think)

[glang]

With the ignition on if you disconnect at the pressure switch and earth the wire the oil light should illuminate. If not you have a supply, bulb or wire problem. If it does light the problem is with the pressure switch....

[RobPearce]

50 minutes ago, Velocita Rosso said:

Am I correct in saying that if I continuity test across the switch body and terminal and it  buzzes, then the switch is faulty?

No, unless you're doing so with the engine running. As YS & glang said, the switch should conduct when there's no pressure.

[Velocita Rosso]

Meant to say...with engine running...earthed to lead to bulb and light comes on...picking up a new switch