Tachometer

Hi,
Tachometer on my 1983 300D works on and off. Thanks for suggestions.

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Cable.
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The tach is NOT cable driven on a 300DT. The tach gets its signal from the pickup at the harmonic balancer. The grey harness goes up to the diagnostic plug on the inner left fender. The cap is a electronic circuit board that converts the A/C signal to the signal the tach understands. Unscrew the cap, remove it, look at the pins, reinstall the cap. It may start working right..... It was a very poor system. In the 84 year models and up, MB got smart and put the tach pickup on the flywheel. Much better system.

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says...

harness goes up to the

board that converts the

look at the pins,

If it doesn't, try putting a cigarette filter in there. Works for me. But only for awhile then I have to replace the cigarette filter. Been meaning to try a pencil eraser.

the tach pickup on the

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