W123

79 300D W123- Neutral safety switch

I've replaced the glow plugs, strap fuse, glow plug relay and the ignition switch on my 79 300D. Intermittently, she doesn't start in PARK ( glow plug indicator light goes on , but doesn't start when the key is turned)-- If I shift to NEUTRAL, she starts fine. I pay attention to the warnings this" Panzerwagen" gives me , so I'm thinking that there's some glitch in the neutral safety switch.
Am I on the right track? Please excuse potentially incorrect terminology- I'm no expert, which id why I subscribe to this helpful forum.
Thanks in advance for your help.

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84 300D Hard Starting Right After Shutdown

I know there is a remedy for this..but I can't find it on here again. My 84 300D starts right up cold, no problem. But after I turn it off and try to restart..the engine just turns over without starting unless I turn the key off then immediately turn the key on again..starts right up...anyone know the answer..? Thanks for any help !!

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1982 300TD Weird compression test results

Checked compression with engine cold one year ago. For this test I started at the front and went straight down the line to the back. Results were 370 - 370 - 370 - 290 - 330. Today I tested the engine warmed up and instead of going down the line I tested each cylinder in firing order. For this test the results were 310 - 310 - 310 - 220- 310.

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