Boost gauge/FMU problems on KB blower

[stangsrule]

Do yourself a favor and get rid of that FMU as soon as possible. They are a bandaid and though they will get you going they make it hard to do do any real tuning. There are many options out there ranging from mail order chips (bottom of my reccomendation list) to on the dyno burned chips (near the top of the list) to full on programmers that let you tune and tweak everything yourself so as you make changes to your car's setup you can also change your computer's tune to match it. I have the TwEECer RT but there are many others out there with more being developed all the time. With the RT I can data log and also have a wideband AFR unit so I can see my AFR live and record it on my laptop. I would also recomend looking into a water/alky injection system, especially if you start to turn up the boost. I was having to mix race with a tank of 92 to keep mine from detonating with 7#'s of boost before, now with my SMS alky injection system I am running 14#'s on straight 92.