Planning to help my friend (who bought my old '78 300D) upgrade to pencil style glow plugs with a conversion kit from Mercedes Source. I realize the glow light runs on a timer, and therefore loses its purpose after upgrading to faster plugs. I'm wondering if the glow timer can be replaced with a later model unit for better accuracy or if anyone has modified the glow light to run on a heat sensor rather than a timer.

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1985 190D 2.2L 717.411 5-speed
1983 300D Euro OM617.950