If you want a boost gauge, you can get the same autometer gauge they use anywhere, you can pay for the Comp Package 'gauge add-on', and use the normal hook-up for the boost gauge as per the instructions. They don't want you tapping into your factory wiring harness, to get the boost reading from the computer, which is what I assume the factory one is doing. You can do the same thing, and have it look the exact same, with the factory housing, and an aftermarket boost gauge. I'd do it that way warranty or not.