Tachometer instead of clock in W123 300D?Is that possible? - Mercedes-Benz Forum

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post #1 of 5 (permalink) Old 05-13-2006, 01:34 PM Thread Starter
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Tachometer instead of clock in W123 300D?Is that possible?

Hi, I have an euro W123 300D and I want to replace the clock in the instrument panel with tachometer (RPM meter). Is that possible? I have seen that all US W123 300D Turbo have tachometer, so I am going to buy RPM meter from US model. But I don’t know where I have to connect the signal wire. To alternator or...? Actually where the tachometer in US models take the information about engine RPM from?
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post #2 of 5 (permalink) Old 05-14-2006, 01:25 AM
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You will need some wire connection for those. There is two types i think. There is one kind you have a sensor unit connected to the flywheel. the other one just pops in the plug thingy in the engine bay area. I'll try to find a pic... I'm sure some of the board members know the exact process how to do it....

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post #3 of 5 (permalink) Old 05-14-2006, 07:50 PM
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Can't you just clip a pick-up unit to the number one wire, like with a timing light?
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post #4 of 5 (permalink) Old 05-14-2006, 11:11 PM
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diesel dont have plug wires
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post #5 of 5 (permalink) Old 05-15-2006, 12:05 AM
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There is a VDO unit that is timed to the alternator signal but I don't know anyone who has actually tried it and been successful with the installation or accuracy.

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