Kit comes with plugs, wires to connect the new plugs together and a relay I think. All you really need are the plugs. You can make your own jumper wires to go from plug to plug. Put in the new plugs, disconnect the ground wire at the most forward plug, hook the rearmost plug to the glow system and put jumper wires between the plugs. I did this on my 77 300d and the quick glow plugs are much better. They don't waste any current in the heavy wires that go with the series plugs. The newer turbo starter will also spin the engine faster if that is what you want.

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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