Connection problem of w109 6.3 tachometer in w108 280SE 4.5 - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 06-25-2009, 03:11 PM Thread Starter
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Date registered: Jun 2009
Vehicle: 280SE 3.5
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Connection problem of w109 6.3 tachometer in w108 280SE 4.5

Hi everybody,

I just registered to this forum in order to find out solution and share problems of my classic mercedes.Recently I'm dealing with placing vintage VDO tachometer which was used in 300SEL 6.3 to my 1972 280SE 4.5 with electronic ignition.

Few months ago,I bought 6.3 tachometer and last week placed to my car by taking out clock from cluster housing.I connected 12V Power voltage and ground connections.But I have problems with pulse connection.I connected pulse to a cable which is green with yellow lines come from electronic box to terminal.However, on idle it works normal but during accelaration after 2000 rpm it falls down to zero(like it does not work) then when I pull off pedal it jumps again and shows.

According to my opinion as 300SEL 6.3 has standard ignition, pulse is directly got from (-) pole of coil, when I connected to my transistorized ignition due to pulse differences tacho does not read.

Please help for instruction to connect this tachometer to transistorized ignition?Because I saw picture that 6.3 tacho was on 300SEL 3.5 which is also electronic ignition.



Last edited by Jazzenco; 06-25-2009 at 03:14 PM.
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post #2 of 2 (permalink) Old 09-24-2009, 12:13 PM
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I came across a 6.3 tach and tested it and found I was getting too high of a reading at idle and the needle would flutter from 0 to its limit when the revs increased. Anyone know anything about all of this?
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