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!