A Smiths classic 52mm electric oil pressure gauge with a chrome half Vee bezel and back lit illumination. Designed for a 52mm (2 1/16") panel hole, they have a 56 mm diameter to the O.D. of the chrome bezel. They should be used in conjunction with a Smiths pressure sensor (PTR1810-1-10, 1/8 NPT) which should be ordered separately and can be found using the links to the right.