Just get one of those inline air tool oilers, and put it on the intake of the pump.  I've got one of those old GM a/c pump that is a mile long.  I don't think it would work on a toy.  I'd like to do a a/c pump on mine eventually. 

I wish my engine compartment was clean enough to paint the frame and everything!  Up till the day I dropped the motor in mine I was still scraping off grease off everything.  Looking good Unc!