[WrenchMonkey]

Years ago, I capped the compressor fittings with 3/4" NPT caps. I seem to remember having to make them fit, but they eventually did. I replaced those with tees (with a ton of teflon tape for insurance) then reduced each leg to 3/8". I considered 1/2", but it really seemed bulky, and 3/8 should still flow triple what my old 1/4 would. (I saw it on the innerweb. Has to be true.)

For the intake side, I got a filter from amazon (p/n UP-104, $12) and an oiler from Harbor Freight (#68233, $11.) The front of the intake tee is just plugged, for an easy access point if I ever have to oil it manually.

On the discharge, I got a 175psi safety blowoff (Viair 92175, $9), and a check valve good for 200psi at 200*. From there, I ran 3/8" copper tube down the firewall. I added a coil (wrapped twice around a coffee can) to hopefully absorb some of the movement of the engine relative to the body. (This is also a decent way to dissipate heat before running rubber hoses, but mine is all metal lines.)