I think the conversion kit uses a threaded sleeve that converts the hole to the size for the pencil plugs. Or you could get one made, for that matter, if you have a good machine shop around.

The dash temp guage is not connected to the glow system -- there is a separate sensor in the head for the systems that use it. Past 1980 (parallel plugs), the temp sensor is a solid state reisistor in the glow plug relay.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!