I have hooked up a 12 volt Mr. Gasket one from Advanced Auto Parts...$36.00 out the door, works great. I used no regulator either...you dont need one. There are two Mr. Gasket ones - one red one and one blue one, the blue one is the one I went for - made for six and eight cylinder vehicles. The red one was made for 4 cylinders and 6 cylinders...go blue...its rated at 5-7 psi.