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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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Mercedes 300te
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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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71 300SEL, 16 BMW Z4, 58 MGA, 80 Triumph TR7, 85 Porsche 911
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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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'77 6.9, 74 240D, 96 Ram 5.9L Cummins
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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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