No need for the kit. Just buy the fast glow plug with the fatter threads (on Fastlane--part number somewhere on a thread on this topic I posted to a few months ago).
Disconnect the final ground wire at the front of the block from the front plug and then connect the hot wire to the first plug near the firewall. Make a set of heavy jumper wires to go from first plug to second and on down the line.
Presto, job complete. Car will start much better.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13