Got my gauges installed this afternoon. 3 Pod A-pillar like alot of others from top to bottom its Pyro, Boost, Rail Pressure. Let me tell you something about the rail pressure if you put the connector on backwards you get all sorts of codes.
I had 7 I don't remember the numbers but I know it was Water in Fuel, Cam postion sensor lost, Throttle position sensor voltage low, Map sensor voltage low, Crank position sensor voltage low. Thats all that I remember but I though WTF when I seen the water in fuel light on in my truck.
It took a little bit to figure it out but I knew the only sensor that I messed with was the rail pressure so I unpluged my gauge and plugged just the factory plug in and all the codes went away. I then plugged my gauge back in and got the codes again. So I flipped the factory connector and they went away again.
So I guess a word of caution about doing a Rail pressure gauge is that with the Issopro connector you can plug the factory plug into it backwards.
But all works well now