With a basic "Pop" tester you can check the pop pressure and observe the spray pattern.

Not quite as good as the tooling the big boys have....but you can get the job done.

Replace the nozzles and a few other small parts.... then shim the springs to get the pop pressure right.

I have done a few sets of "Squirts" for the 6.2/6.5 and other than the time to fool with them....They were fine......

I can't imagine the units for the DMAX being any tougher to do...

The LB7 squirts from what I have read were basically flawed from the get go and tend to be very fussy about any dirt in the fuel......

Be fun to rip into a set and give it a go.....