So your gauge is mechanical? And it drops to zero within a couple seconds of shutting the engine off? That's very bad. You have a bad regulator, and possibly a bad pump. Replace the reg first, and see what happens. Follow Dark 5.0's instructions for setting the pressure. Most importantly, observe how long it takes for the pressure to bleed down after the engine is shut off with the new reg. It shouldn't drop at all for several minutes.
Lucas makes awesome stuff. If you've got it, go for it.
Take care,
~Chris
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