I'll post a pic of the way I did mighn. I've got a 2 gallon tank hooked up back left. With the compressor pointing sitting vertically so I can drain it. The Tank and Compressor are attached, its a Viair 20005 or something. Runs at 150PSI.
---------- Post added at 11:22 PM ---------- Previous post was at 11:20 PM ----------
Good luck mounting a 5 gallon tank under there btw. If you do it successfully PLEASE take pictures.