Quality aftermarket single spade oil pressure switch fits Perkins 4.107 that take an earth supply from the engine block. It has a tapered screw thread and single spade type electrical connection for 12v or 24v systems.
Please note that this switch works the control panel low oil pressure warning light (or alarm). It is not a resistance sender for an oil pressure gauge.
UK delivery is by 1st class Royal Mail. European and Worldwide delivery is available.