I currently have the Dawes Boost pressure controller for my turbo. Over the last several months when I hook up a guage to check the pressure (at each oil change), the boost is lower than I had set it to and I have to re-adjust the controller. I am about to the end of the adjustment. Is it common for this device to get weak and change the pressure? I have thought about the electronic controller. Anybody have any experience with this type. Only thing is that they are expensive. Whatever I do I have got to get a guage inside the car. I saw the link on a post the other day about a small digital guage that I could probably install in the ashtray. I just don't know how I am going to route a wire through the firewall.

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1995 S-350
370K + SOLD
1952 220B Cabriolet
39K kilometers + SOLD
1998 E300D
310K +
2012 E350 BlueTec
120K