The AIH with the fitting for the boost works like a champ. Easy hook up. I can tell you I had the dual relief valve at first, and I am not a big fan of it. Boost readings were up and down, and in my case it did not prevent the SES light from kicking on.
The AIH plug will give you a much more accurate reading vs. the DRV, I saw in other post that you are considering the MAP Maximizer as well, again, a good bet vs. the DRV.