Thanks maxman, I did the same. Only one check valve and one air line leading to the tank. Used Viairs 85-105 pressure sw relay combo, non adjustable that Im aware of. I did have the check valve located in the wrong spot when I first put it together, in my system it needed to be the first fitting off the compressor. It seems to be working well. Its been just to cold here to get underneath and do a thorough leak test on all the junctions. Its bleeding down after about 3 days so Ive got a small leak somewhere. But its pretty much good to go as it is.