Rem, I bot a set of plastic T's from autozone, and the brass fitting for the spark plug hole came with the pressure tester kit. I will check the thread and diameter sizes when I get home and post them on here, pretty sure you can find it cheap on ebay.

Grk, I got my gauge from Harbor Freight and it's 0-10psi. If you don't have it in your area you could order it online, but I'm not sure how much they charge for shipping.