I just replaced mine awhile back...but before replaced my tach would fall down to nothing and it appeared that the turbocharger wasnt working. Darn lights on the cluster acted like a pinball machine. So I took the forums advice and replaced it with an OEM relay and sha...zam it worked...no more odd stuff has happened since... I cracked my plastic shield upon reinstallation also..oh well

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1993 300D 2.5L 240,000+ miles