Quality aftermarket single spade oil pressure switch fits Perkins M90 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 both of these switches work the low oil pressure warning light (or alarm). They are not oil pressure gauge senders.
UK delivery is by 1st class Royal Mail. European and Worldwide delivery is available.