Sounds like one of those guys who wants blow-off noise without the turbo. Similarly, why don't you just use a boost gage and take it to an electronics expert and get them to wire it up so the needle moves randomly. (This is as bad as gluing a Type R badge on.)
If you want a gauge, the best suggestion I can make is get a bling bling Tachometer. If you like bright lights, you can get one that has a shift light! The tacho will move "often" (assuming you actually drive the car) and it will actually have a practical purpose too.
If for some reason you wanted to pretend to have boost, you could take the gaugue apart and replace the writing with "Boost" and voila.
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