pressure oil switch for Carrier engines 12vdc, N.O.(normal open), 15psig, 1/8"NPT, two wire.p/n 12-00456-00, 12-00592-00Fits:Vector 1800, Supra 422, Supra 450, Supra 550, Supra 622, Supra 644, Supra 722, Supra 744, Supra 750, Supra 850, Supra 922, Supra 950, Maxima 1000, Maxima 1300