Not hard exactly. Change some hard parts, add some custom parts. Swap gearcase and pump is the biggest part of it. Sucks cause you have to pull the cam to swap gearcase. That's a pain. But perfect time to upgrade cam, and stick one in that has the mechanical lift pump lobe. So you can feed the ppump with the stout OEM piston style transfer pump. Custom lines and injector pop pressures reset for new pump. Rig up, throttle cable. Were talking zero electronics.
You can do it from scratch if you have the parts. Or a few places like scheids diesel makes conversion kits with pumps, For some bucks.
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