I like to convert my old style glow-plugs to the later ones. I saw a conversion kit at "**************" for $112; is it worth the price or is this something I can make my self? It says that the wiring is special....?

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1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).