I purchased my two about 4 months ago and the tachometer never worked and the boost gauge spuraticly works once in a great while. I know the Boost gauge has to get power because every time I start the engine it goes up to max boost then goes back down. But on the other hand I'm clueless on why the tach doesn't work. I bought and aftermarket boost gauge (45mm Omari) just never put it in yet. Just wondering if I can fix the one now so the after market gauge doesn't do the same thing.