Retrofit tachometer 1987 W124 300D

[swainston]

Can anyone help with information on retrofitting a tachometer to my 1987 W124 300D? - this is the first car I have had without one and I hate the big clock where the tachometer should be.

 

[Dieselman]

You will need a crank sensor and an amplifier board and obviously the tachometer.

 

[bolide]

DM, where does the amplifier board live? Wonder if that's the source of intermittent tachos on the late W124 diesels

Nick Froome

 

[Dieselman]

Not actually seen it, but believe it to be in the fusebox near the diagnostic socket.

I have heard that cracked solder joints do cause intermittent tacho and one fix is to apply some pressure with cars inserted under the cover.

 

[bolide]

Is it in the kickdown relay I wonder?

Nick Froome

 

[Dieselman]

Possible, because on the 320 petrol the tacho signal is definitely via the kickdown relay.

 

[swainston]

You will need a crank sensor and an amplifier board and obviously the tachometer.

Thanks Dieselman - I have the tachometer from a W124 diesel so I now need to get the amplifier board and the crank sensor. Is it a difficult job to do? Mine is a manual btw.