You may want to eventually upgrade to fast start pencil glow plugs.
It may save you some trouble in the long run.

Google "DSL-EARLYGOR-4" for Kent's kit.
https://www.youtube.com/watch?v=anyIzllzbW0

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022