horn-activated tachometer

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horn-activated tachometer

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04-05-2005, 04:12 AM

Swan

Stop looking at me, swan!

Join Date: Mar 2005

Posts: 11

horn-activated tachometer

here's a brain bender. the tachometer in my 1979 300sd (w116) works only some of the time. quite often, when it's dead, i'll honk the horn ever so briefly and the guage jumps to life with the current engine speed. any ideas? thanks.

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1979 300sBd (that's Bio, baby!) - 170,000 miles

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