Thanks, bunkclimber. I didn't get the plans, so I'm not sure if I'm using the recommended pump. There's a photo of it attached to the original post. It's stamped with "635400271", which I think makes it a Bucher, possibly in the AP100 series.

Attached to this email is a photo of the valve body. I think that's a relief valve, in the first photo? Maybe even a relief valve on each...?

To measure pressure, I think I could attach a gauge to a quick connect, then remove the hose for one of the cylinders to test pressure. Is that reasonable, or do I want an in-line gauge that I leave attached while I'm running it?

Attached Images
valve.jpg (64.45 KB, 85 downloads)
valve2.jpg (56.08 KB, 83 downloads)