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Something arched inside the gauge so you will need a new gauge. The vibration could be the rotor. I think, I've read that you could pull the rotor and turn it 180 degrees to help with vibration problems. But that could have been on something else I was working on.

Yes, if an injector is not working correctly you'll see a swing of more than 8 degrees plus or minus. They could be all out of wack so take some temperature readings and report back.

I take the temperatures on the head, right below where it attaches to the exhaust manifold. You'll have 4 flat portions of the head, it's about even with the oil pressure sending unit. Temperatures usually are 190-198 with no load and there will be about 1-2 degrees difference.

Have you put a load on it yet? You could have an injector not firing correctly causing the vibration. Usually it won't hold a 10kw load with a bad injector. Also, could be the mounts. I believe the mounts for the 802a are little softer and if someone mismatched the mounts, it would cause more...