Attach the ground wire from the body/engine attachmnt to the positive for positive ground.
Oh, and good. Usually you can take the mechanical arm and push it to see if it is pumping, but then again, if it was frozen in the open position you still wouldn't know if it was working properly, haha. They are pretty simple pumps, and as long as the arm is the same length and the bolt pattern/gasket to the block is the same or seals against the block, yeah, there were quite a few different appearances, but they should still work.