Although it's been done successfully, I would not for one inkling of a moment consider using the electronic DS4 pump in a conversion, especially into a CJ. I would dump that electronic pump and all associated components, and go with a mechanical DB2 pump. All you need then is one wire to hold open the fuel solenoid to keep the engine running, and then a few wires for the glow plug system. Get a stand-alone computer for the tranny, such as from a 93 model 6.5L truck or aftermarket version, or use a TH700R4 that needs nothing but one wire for the TC lock-up functions.
I wouldn't bother with upgrading to a marine pump. They're expensive and I don't think you'd ever use that much power in such a light vehicle. The base engine for your CJ was a 2.5L 4-cylinder, so a 6.5L V-8 turbo diesel, even stock, will rock your world!
Again, my advice is dump the DS4 and run run run!!! They're okay in a stock vehicle, but I would never go through that much work to retrofit it into another vehicle, especially a CJ. Also, the '94 models had extra quirks that are not very desirable.
I've done two diesel conversions and am getting ready to start my third, by swapping in a 6.2L into a 93 Jeep Grand Cherokee, to use as an off-road toy.
Casey
1995 K1500 Tahoe 2 door, 6.5LTD, 4L80E, NP241, 3.42's, 285/75R16 BFG K02's; 1997 506 block; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, HX35 turbo, Turbo Master, 3.5" Kennedy exhaust, F code intake; dual t/stats, HO water pump, Champion radiator; Racor fuel filter