Our standard aftermarket single spade oil pressure switch fits Perkins 4.154 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.
On marine versions, Perkins would often isolate the engine block from the earth (-) supply and in these cases a twin spade oil pressure switch is needed. New ones are now hard to source, but we hope to have stock very soon.
Please note that this part controls the 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.