A regular air compressor supply shop should have what you are looking for. The contacts could be rated for 110 ac but will work for a dc just make sure of amperage rating. If I'm not mistaking you should be looking for about 10 amps for the clutch.
A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
I have one like that, but i don't know which of the outlets to use. It has 4 or 5. It came off a used compressor that was taken apart when I got it. I have looked up the part number and all i could find was replacement ones not plumbing diagrams for it.
it is a 110v compressor so i had to take it all apart and do the regular oba set up with the ac pump but it has all the required gismos in one packidge so all you would need to buy is an oiler a toggle switch some wire and some air hose. it worked out sweet for me.