My 350 SDL's intermittent tach and a/c problem just got worse ... I checked the speed sensor pickup at the bell housing - it had a few metallic flakes on it, but looked good otherwise - did not fix problem. Checked every cable connector and could find nothing but great connections ... checked all fuses (although I don't think a single fuse, with no other failures, would cause the a/c and tac to both fail) ... nothing changed problem.

Finally, looked at Klima connections (part number 0035452605) ... one of the terminals was a little dark ... started and ran engine ... still no tach or a/c .... smacked the Klima with a wrench and got all functions back normal. Touched Klima again and lost 'em all.

Guess I will have to replace the relay ... initial part search turns up ludicrous price of $200!! Any other options?

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg