What ever brand anyone decides on ...

This is from Monark Diesel's technical department. (I think I translated it all correctly)

TESTING AND ADJUSTING
Nozzle needle and body are lap fitted to each other and should never be mismatched.
Testing should be carried out with clean diesel fuel oil or test oil meeting ISO 4113.
NEVER USE GASOLINE FOR TESTING! EXPLOSION OR FIRE COULD RESULT.
Keep hands away from nozzle spray. It can penetrate deep into the skin and and destroy the tissues. Fuel oil in the blood stream can cause blood poisoning.

Clean all nozzles.
Remove special conservation oil completely from new nozzles by washing them in clean gasoline.
Clean used nozzles of soot and carbon and likewise wash in gasoline. Allow them to dry then dip nozzles in clean fuel oil and insert them into injector body.

Testing.
When assembling, hand center and tighten before tightening with a wrench. Cap nut torques: 'P' nozzle 30-50Nm, 'S' nozzle 50-90Nm, 'T' nozzle 80-100Nm (verify for your specific application)
Verify nozzle is not jammed by connecting to the tester with the gauge stopcock OFF.
Operate the pump lever several times, forcefully about 6-8 pumps per second. If the needle is not jammed, the nozzle should chatter with a shrill whistle. If not, loosen the cap nut, rotate the nozzle and tighten. NOTE: hole type nozzles (IE: SD 240) will not chatter like pintle type nozzles even when the lever is pumped quickly.

Opening (pop) pressure.
Pressure is specific to your engine. Adjust it accordingly. It is sometimes stamped on the injector body.
CAUTION: WHEN PRESSURE GAUGE IS BEING USED increase and decrease pressure slowly or gauge damage may result. Slowly increase the pressure until slight chattering, read indicated pressure. Turn adjusting screw or change shims as necessary. When the lever is operated slowly (1-2 pumps per second) all nozzles should spray/chatter. However, the spray need not be even or well atomized.

Leakage test.
Operate lever until gauge indicates 20 bar (285 psi) below specified pressure. The nozzle does not leak if no drop of fuel falls from the nozzle in 10 seconds.

Chatter and spray pattern.
Close the gauge stopcock. Spray pattern is observed when the lever is pumped rapidly (4-6 per second.)
The pattern for pintle and throttle nozzles should be even and well atomized. For hole type nozzles, full and finely atomized.

Cleanliness is essential when testing. The test area should be free of dust and dirt. Only use clean diesel fuel or test oil.
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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!