On the machine shop's rig, they just have a sprocket welded to a sleeve that fits over the end of the crankshaft and a roll pin driven through the hole where the crank pin was.
A chain will not hold up to full-throttle operation very long. They basically idle their tractor around the yard and use it for loading and unloading iron, etc.
I don't have a pressure relief valve on my system, but I DO have a priority flow valve so that the power steering gets oil first. Northerntool.com still has them for around $85 or so.
Here are more pictures that I have of the machine shop rig:
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