I got one of the first ones when they came out, no problems, functioning perfectly. I also was a little disappointed with the lighting, I like the lighting in the ISSPRO gauges much better.
My pressures are constant, no jumps or fluctuation, same all the time at idle and also at various speeds. I get about a 1K jump when I turn on the Quad STD box to the 1st position(30) and another close to 1K jump in the second position(60). Can't tell you about the 3rd position as I have yet to use it.
Personally I like the old fashioned gauges, the new digitals are nice, but not my style.
CD