you can make your own lockup for the tranny---all you need is a on off pressure switch---pull one off a 80-90's chrysler AC unit---there is a diagram for it on line------basically the hot wire into the 2 plug lead--then the negative wire goes to the pressure port on the other side of tranny where the pressure switch is now installed---then up to your dash where you have an option if a toggle on/off---then ground back to the tranny....PATC has the diagram and explanation online....their switches are expensive----i usually just grab a few at the pick apart----on some foreign cars the same style of switches will actually have the BAR value printed right on them---the mopar AC switch works just fine...