Having that gauge seems strange, I've never seen it done OEM. I've seen a few home-made hookups where people wanted to monitor interal fuel pressure that runs the timing advance (60 PSI gives full advance).
How high does the gauge go?
Before you get too involved, you ought to pull the little rectangular timing window off the side of the pump. Then turn the engine over and see if anything side is moving. If the pump shaft did NOT break, as Bob already mentioned, you'll have the parts inside moving whenever the engine is spinning. If you see nothing moving, you're screwed. Shaft if broken and pump probably ruined. If half of what you see is moving, but you find little specs all over that look like mouse turds - the pump needs a teardown and some parts.
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