Larry, do you just have a gauge with a quick coupler on one of the hydraulic male couplers? Or do you actually install in in line with the loader? I know I could look at the wsm. But where is the spring at on these tractors?
The relief valve is on the right hand side as your sitting on the machine, it's on the right side of the transmission, behind the tire. There is plenty of space to get to it from underneath, even with the backhoe subframe.
I used the BXpanded Pressure kit, it's the fluid filled guage, and the factory assortment of shims.
You shut off the machine, relieve pressure by swirling the loader lever, and then unplug the rear most front loader hose, the fluid filled guage then plugs into that connection.
Start your (already warmed up) machine and run to the rated 2,400 RPM. Apply loader lever motion and watch for guage motion, it should be pulling straight back as if lifting a load... But test to be sure your plumbed standard. Once you verify what loader lever motion you need, fully apply it and hold it until the guage stops creeping up, record this pressure.
Shut engine off after returning to idle. Ad/remove/swap shims to and try again for desired results.
Swirl the loader lever to relieve pressure, remove guage, attach loader hydraulic line, go dig something!
If you want a photo, I can take one for you.