the HF kit I got did indeed come with fittings for the glow plugs on my car... of course it was the large body glow plugs I was testing...

and the 617 procedure I used was:
1 remove all glow plugs, injector lines, and accelerator linkage.
2 wire the IP in the full STOP position.
3 connect the fitting to the glow plug hole and connect the tester.
4 Crank the engine until the pressure stops rising.
5 bleed off the pressure, and remove tester and fittings, move to the next hole.
repeat.

I found it impossible to get the fitting on with the injector lines in place.
my car kept squirting fuel out the IP, so I put the lines back on the IP, and swung them out of my way. prepare for a mess of diesel fuel. the stop lever must prevent pressure build up, but I still got a fair amount of fuel squirting.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!