I ca pull it out about an inch or so but I think the speedo cable is holding it from behind. How do I release the speedo cable? I tried accessing it from below but it's impossible as there's to much stuff down there.

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1992 Mercedes 190D 2.5 turbo 5sp manual. EGT+boost gauges. Boost controller set to ~14.5 psi. 1 1/4 turns on full load adjustment. LPG injection. Next in the list is water injection.