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Can you command the ITV, EGR, and VNT through their ranges? Does fuel pressure target and actual match each other? Is everything plugged in?

Air or hydraulic brakes?

That's interesting. In my experience, the ECUs they put in Hinos are pretty robust and are rarely the problem.

The slave cylinder is moving the release arm correctly? Does this one have a slave cylinder return spring?

The truck really needs to be hooked up to the DXII software to get an accurate diagnosis. Start with this. It sounds like you lost the range switch on the side of the transmission where the gear shift shaft goes in. Water gets in these switches and messes them up.. There's an updated wiring...

There's really no way of knowing how much oil was released when the line was broken. Here's a chart that might provide some insight.

Check that the big o-ring didn't fall off of the clear plastic housing, I've seen them installed improperly causing these symptoms.

Go to the engine menu-data monitor and active test-active test settings, scroll down and you'll find it.

No, there is no engine oil pressure sensor, just a switch for the low oil pressure light.

You don't need to prefill it. Just bolt in on, start the engine, shut it off, and check fluid level in ps reservoir.

Yes, power steering fluid will come out. Just top it off when you're done. It takes dexron III.

Sounds like the hydrovac is leaking. Put 12v on the aux motor and see if it turns on.

5000? That can't possibly be right. When it first starts up it'll be higher until it warms up, then it'll idle at 750.

The atomizer is the actual module, not the burner nozzle. If you're getting this code, the atomizer should be replaced.

It is normal for those to do a regen every 100 or so miles. You're within the normal range. Do you ever have to do a manual regen? If you do, how long do they take?

I have seen this failure numerous times with the 3126 and C7.

Update: water can get into the firewall junction box from a leaking windshield seal. If it gets into the CAN wiring, all sorts of weird things happen. The junction box needs to be opened up and inspected for water.

I don't know if they're the same or not. There was a big step up in emissions stuff between those years. The VNT controller is calibrated to the turbo at the factory, so swapping controllers often doesn't work correctly.

Unfortunately Hino doesn't give out much oscilloscope data, so I can't help you there. It definitely sounds like a low fuel pressure issue, and you've already checked the rail pressure limiter.

I think you're going to need to have it scanned to check for codes. Aisin transmission?