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Did you check the cracking pressure before and after cleaning it? Did it change?

Thanks. I'm at the office right now and can't check out the manuals.

Since you have the side plate off you should check the oil pump bypass valve. If its stuck open that could account for the low oil pressure.

Most Excellent!

Is this even an option that helps? Convert it to electric? https://www.steelsoldiers.com/showthread.php?130644-Convert-M105-M200-or-other-air-over-hydraulic-brake-trailer-to-electric-how-to&p=1616736&viewfull=1#post1616736

The vibe dampener is a horse mat from your local farm supply.

Yep. That sounds about right. Mine is heavy as crap.

Voltage drop is proportional to current (load). No load means no voltage drop. At these values I'm not really worried about it. 7V @ 56A isn't a big deal. 4.4V is certainly better. Where it comes into play most is with motor starting. You need a good voltage and amperage kick to get a motor...

For 100' length running 240v: 8 gauge will give you about 7v of drop at 56a 6 gauge will give you about 4.4v of drop at 56a

You were in reality around 90% load.

The first thing I do when presented with a pegged pressure gauge is to use a known good mechanical gauge to verify that the condition the electrical gauge is reading isn't true. Its likely if the oil pressure is pegged out that the lifters will pump up so much to float the valves but that aside...

Not weird when you look at the schematic and see that the load signals go through those switches. Glad you got it up and going.

Switching the wires on the gauge had nothing to do with the unit tripping out. Cleaning the switches is a common fix for early tripping.

Recommend a clamp on amp meter. See what it is really doing.

In addition to going through the troubleshooting section of the TM I would for sure say to check the low oil pressure switch.

8 GA type W will be good for a very short run only. If you are running 50' to 100' you should use 6 GA.

You will need 24v to run the controls and the governor.

Supply and demand. Iron Planet must have better marketing thus driving up demand.

THHN is not rated for wet locations. THWN is the correct wire for wet locations. Underground conduit is considered a wet location.

Have you gone by your local big box home store to see what they have on the "by the foot" wall? I don't recall #4 being that costly. Since this is underground make sure the wire is rated THWN. THHN isn't rated for underground applications. Most wire these days are rated for both but its good...