So... as far as converting my 85 to an 83ish setup, given my current setup, what do i need to do??? I believe the following:

-Obtain the base for the tach amp from my 83 300D. This will get me pin #3.

-Also acquire tach and other end of the tach cable (the end that plugs into the cluster) to have the correct harness.

-Connect wire from tach amp base to correct 2-pin harness for old style tachometer. This will provide a working tach signal, since my engine has the correct button on the harmonic balancer, so it ought to provide a good signal.

Thanks!

JMH

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)