| I changed the oil pressure switch twice on the 900ss in the 24000 miles I had it. First one worked erratically, the second one leaked at the terminal blade. Like KeefyB, as far as I can tell they are all the same and one for a Volkswagen Polo fits. The thread is 10mm x 1.0mm pitch and about 12mm in length. Costs about a Fiver from a motor factor. | 
Threaded Mode