The boost reading should be different since the boost on Edge is reading through the map, and the juice has a boost fooler. Your analog gauge is showing what the truck is actually doing. If all you are seeing is the difference in boost reading I wouldn't worry about it. If the truck acts like there is a problem pull the Edge and see if the problems stays. Im betting that its just something to do with the boost fooling.
Thanks for the reply.
I would certainly expect the boost value as seen by the stock ECU to be different than the actual value, because the Edge is intercepting and simulating the value that's passed on to the ECU. However, I fail to see any logic in the Edge itself reporting a boost value on its display around 10psi higher than actual, especially if it's setting off the overboost alarm! The Edge and the analog gauge should read the same at all times or the Edge's boost display is useless (well, within 2-3psi considering I'm at 4200ft altitude and the Edge is probably reporting MAP - 1atm while the mechanical gauge is reporting relative pressure).
The truck doesn't certainly seem to act like it's overboosting, considering it's not actually seeing the boost the Edge is reporting... but I'm not sure I could tell if it were running right for the boost level it is seeing just by the seat of my pants. If the truck is fueling for 15psi when it's only actually running 5psi, that seems to me to be an issue if only with reduced fuel mileage.
Again, this doesn't seem to happen frequently, but it's often enough that I worry there may be something failing. I'm just trying to figure out if the problem is with the Edge or with the stock sensor(s). Removing the Edge won't tell me anything, because it's the Edge's boost gauge I need to see to try to see the MAP value of the ECU. I guess I could set it to the "stock" map and see if the problem occurs... I can't recall ever seeing the overboost on the stock setting... but I rarely drive around on stock.
What this really boils down to is, what value does the Edge's boost gauge report? If it's just a 1 to 1 reporting of the stock MAP sensor, then likely my MAP sensor is going bad and reporting too high a value. But if there's some software manipulating that number before displaying it, I'd bet it's more likely a bug in the Edge's software.
Anyone know how much a MAP sensor costs and how hard it is to replace? Or does anyone know if there's a newer firmware revision for the Edge, and whether or not they're easy to deal with for upgrades?