good choice on gauges. only other one I would have considered is oil pressure since factory is pretty much a dummy gauge. tell your friend he is stupid. I would rather have a fuel pressure gauge than a/f gauge myself. the a/f gauge bounces around so much, it is hard to keep track of it. the fuel pressure will go up and should stay there. you don't have a lot of time to sit there and keep watching the gauges. I find it easier to keep an eye on the fuel pressure than the a/f that I used to have.