RPM Meter installation

Can anyone advise or provide any schematic diagram to install an aftermarket RPM meter for the Citroen Jumpy 1.9D ? The Jumpy van comes with a stupid
big face clock right beside the speedometer.
Imagine most of the renown mechanics and motorshops here in Singapore dun know how to install one ! They managed to do it for the Renault Kangoo and most Japanese commercial makes but none are smart enough for the Jumpy. Getting kinda frustrating and I might just have to forget the idea.
Appreciate any help and input pls.
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Nobody has got any idea on how to go about it ? Pls help in any u can ...

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At first you will need a rpm meter special for use with a diesel engine, connecting is is very easy, yust need to connect tree wires. One (red) to a hot terminal (fused) past the ignition switch. One ground wire (black) and the third wire (any colour) to the G connection on the alternator. On diesel engines the RPM signal is usually dranw from 1 phase on the alternator.

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